| 释义 |
thresh·old
I. \ˈthreshˌ(h)ōld\ noun
(-s)
Etymology: Middle English threshwold, thresshold, from Old English threscwald, threscold, akin to Old Norse threskjöldr threshold, Old English threscan, therscan to thresh
1. : the plank, stone, or piece of timber or metal that lies under a door; especially : sill
2.
a. : gate, door
b.
(1) : end, boundary; specifically : the end of a runway
(2) : the place or point of entering or beginning : entrance, outset
< the threshold of an era of scientific and technological development — A.L.Nickerson >
< on the threshold of adulthood — Frances Keene >
< a hamlet on the threshold of a narrow valley — American Guide Series: Oregon >
3. [translation of German schwelle] : the point at which a physiological or psychological effect begins to be produced (as the degree of stimulation of a nerve or nerve center which just produces a response or the concentration of sugar in the blood at which sugar just begins to pass the barrier of the kidneys and enter the urine)
< below the threshold of consciousness >
< the threshold of pain >
< a high renal clearance threshold >
< with an alteration of the physical environment some ecological thresholds of the ecosystem or of certain of its components may be crossed and the system disrupted — J.R.Beerbower >
II. adjective
1. : resembling a threshold; also : suggesting a threshold in nature, use, or function
2. : that constitutes a threshold
< a threshold voltage >
< threshold levels of sugar > |