| 释义 |
Definition of jackknife in English: jackknifenounPlural jackknives ˈdʒaknʌɪfˈdʒækˌnaɪf 1A large knife with a folding blade. Example sentencesExamples - Pen clips, protractors, and jackknives have left hacked shapes to tell people how dull it all was when they sat here.
- Adam had chosen a jackknife rather than a fixed blade.
- I ducked down in onto my hands and knees, and right before my eyes, I saw the jackknife that Todd was carrying discarded on the ground, it was tremendously shiny, and glittered in the company of a red handle.
- With a jackknife, he whittled a point on a thin green stick pulled from a maple branch.
- The shorter girl snarled her frustration and lunged after him with her jackknife, tearing a horizontal gash in his right pant leg.
2A dive in which the body is first bent at the waist and then straightened. Example sentencesExamples - But still, I usually like to lounge about in a chaise lounge or something while everyone else is doing cannonballs and jackknives and freakish flips off the diving board.
- Westmount borough chairman Karin Marks, on the threat of non-residents coming en masse to do jackknives in the Westmount pool
- Though his past leaps of faith have had about as much grace as a jackknife into a leaf-covered pool, bringing Gibbs back has ‘reverse pike triple somersault’ written all over it.
- With his opponent flat in the center of the ring, Van Dam climbs to the top turnbuckle, springs across the ring crouching and extending his torso like a diver performing a jackknife.
3Statistics
A method of assessing the variability of data by repeating a calculation on the sets of data obtained by removing one value from the complete set. Example sentencesExamples - We used the jackknife version of cross-validation, where the training set consists of the complete network minus a single specified edge.
- Higher-order jackknife estimates lead to successively greater reductions in the bias of the estimates of N d, but at the cost of increasing sampling variance.
- To evaluate clade support, bootstrap and jackknife analyses were performed in PAUP * using a full heuristic search with 1000 replicates, simple addition sequence, and TBR branch-swapping.
- Occasionally, low Bremer support is correlated with a high jackknife percentage, e.g., at the node separating the Wnt1 subfamily from the rest of the tree and at the base of the vertebrate Wnt 10 sequences.
- Bootstrap and jackknife analyses were performed under the MP criterion, with equal weights for all positions and two random additions of sequences for 200 replicate searches.
verbjackknifed, jackknifes, jackknifing ˈdʒaknʌɪfˈdʒækˌnaɪf [no object]1Move one's body into a bent or doubled-up position. she jackknifed into a sitting position Example sentencesExamples - A spasm jackknifed me, crunched the air right out of me.
- Jimjim's body suddenly jackknifed, wrenching his figure to the side.
- Students then jackknife their legs even closer to their bodies to the rhythm of a driving beat.
- With a harsh indrawn breath, I jackknife to a sitting position.
- Galindo devilishly liked to stun nurses by jackknifing himself into a completely folded hospital bed.
- 1.1 (of an articulated vehicle) bend into a V-shape in an uncontrolled skidding movement.
the accident happened when a lorry jackknifed Example sentencesExamples - The snow came down in handfuls and cars jackknifed to the left and right of us as we drove east on unplowed streets.
- A semi-tractor and trailer jackknifed coming down the icy hill on Northeast North Woodinville Way at about the 14500 block.
- Similarly, neither of the two units will be damaged if the trailer jackknifes with respect to the tractor.
- Mr William tried to slow down by pumping his brakes but the vehicle jackknifed in the road while trying to avoid Mr Utting.
- A double-semi had jackknifed, neatly shutting down four lanes.
- 1.2 (of a diver) perform a jackknife.
Definition of jackknife in US English: jackknifenounˈdʒækˌnaɪfˈjakˌnīf 1A knife with a folding blade. Example sentencesExamples - With a jackknife, he whittled a point on a thin green stick pulled from a maple branch.
- Pen clips, protractors, and jackknives have left hacked shapes to tell people how dull it all was when they sat here.
- Adam had chosen a jackknife rather than a fixed blade.
- The shorter girl snarled her frustration and lunged after him with her jackknife, tearing a horizontal gash in his right pant leg.
- I ducked down in onto my hands and knees, and right before my eyes, I saw the jackknife that Todd was carrying discarded on the ground, it was tremendously shiny, and glittered in the company of a red handle.
2A dive in which the body is first bent at the waist and then straightened. Example sentencesExamples - Westmount borough chairman Karin Marks, on the threat of non-residents coming en masse to do jackknives in the Westmount pool
- Though his past leaps of faith have had about as much grace as a jackknife into a leaf-covered pool, bringing Gibbs back has ‘reverse pike triple somersault’ written all over it.
- But still, I usually like to lounge about in a chaise lounge or something while everyone else is doing cannonballs and jackknives and freakish flips off the diving board.
- With his opponent flat in the center of the ring, Van Dam climbs to the top turnbuckle, springs across the ring crouching and extending his torso like a diver performing a jackknife.
3Statistics
A method of assessing the variability of data by repeating a calculation on the sets of data obtained by removing one value from the complete set. Example sentencesExamples - Higher-order jackknife estimates lead to successively greater reductions in the bias of the estimates of N d, but at the cost of increasing sampling variance.
- Occasionally, low Bremer support is correlated with a high jackknife percentage, e.g., at the node separating the Wnt1 subfamily from the rest of the tree and at the base of the vertebrate Wnt 10 sequences.
- We used the jackknife version of cross-validation, where the training set consists of the complete network minus a single specified edge.
- To evaluate clade support, bootstrap and jackknife analyses were performed in PAUP * using a full heuristic search with 1000 replicates, simple addition sequence, and TBR branch-swapping.
- Bootstrap and jackknife analyses were performed under the MP criterion, with equal weights for all positions and two random additions of sequences for 200 replicate searches.
verbˈdʒækˌnaɪfˈjakˌnīf [no object]1Move one's body into a bent or doubled-up position. no object she jackknifed into a sitting position the Major jackknifed his thin body at the waist Example sentencesExamples - A spasm jackknifed me, crunched the air right out of me.
- Students then jackknife their legs even closer to their bodies to the rhythm of a driving beat.
- Galindo devilishly liked to stun nurses by jackknifing himself into a completely folded hospital bed.
- Jimjim's body suddenly jackknifed, wrenching his figure to the side.
- With a harsh indrawn breath, I jackknife to a sitting position.
- 1.1no object (of an articulated vehicle) bend into a V-shape in an uncontrolled skidding movement.
Example sentencesExamples - A double-semi had jackknifed, neatly shutting down four lanes.
- Similarly, neither of the two units will be damaged if the trailer jackknifes with respect to the tractor.
- The snow came down in handfuls and cars jackknifed to the left and right of us as we drove east on unplowed streets.
- Mr William tried to slow down by pumping his brakes but the vehicle jackknifed in the road while trying to avoid Mr Utting.
- A semi-tractor and trailer jackknifed coming down the icy hill on Northeast North Woodinville Way at about the 14500 block.
- 1.2no object (of a diver) perform a jackknife.
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