| 释义 |
pulsate, v.|pʌlˈseɪt, ˈpʌlseɪt|
[f. L. pulsāt-, ppl. stem of pulsāre to push, strike, beat, freq. of pellĕre, puls- to drive, strike, beat.]
1. intr. To expand and contract rhythmically, as the heart or an artery; to exhibit a pulse; to beat, throb. (Chiefly in scientific use.)
1794E. Darwin Zoon. I. x. 49 The heart of a viper or frog will continue to pulsate long after it is taken from the body. 1813Sir H. Davy Agric. Chem. (1814) 215 From the moment the heart begins to pulsate till it ceases to beat, the aeration of the blood is constant. 1899Allbutt's Syst. Med. VII. 239 It has been asserted that the brain cannot pulsate in the closed cranium.
b. fig. or in figurative allusion, of life, feeling, etc.
1847Emerson Poems, Saadi vii, Leaves twinkle, flowers like persons be, And life pulsates in rock or tree. 1858O. W. Holmes Aut. Breakf.-t. iv, What strains and strophes of unwritten verse pulsate through my soul when I open a certain closet in the ancient house where I was born! 1883Schaff's Encycl. Relig. Knowl. 2318 The Punic blood of his descent is visibly pulsating in his style.
2. intr. gen. To strike upon something with a rhythmical succession of strokes; to move with a regular alternating motion; to exhibit such a movement; to beat, vibrate, quiver, thrill.
1861Times 22 Oct., The air pulsates with the flash of arms in the sunlight. 1867Lewes Hist. Philos. (ed. 3) I. p. cii, The sensation excited..by that undulation pulsating on our tympanum. 1881G. Forbes in Nature 18 Aug. 361/1 Dr. Bjerknes reproduces this experiment by causing two drums to pulsate in concord, the one above the other. 1884H. Spencer in 19th Cent. Jan. 10 The spectroscope proves..that molecules on the Earth pulsate in harmony with molecules in the stars.
3. trans. To agitate with a pulsator (sense 2).
1891Blackw. Mag. Sept. 322 The stuff to be pulsated.
Hence pulˈsating vbl. n. (also attrib. in sense 3, as pulsating-pan); pulˈsating ppl. a., that pulsates, exhibiting a pulsation or pulse; spec. of an electric current or voltage: flowing or acting in one direction but with a periodically varying strength.
1807–26S. Cooper First Lines Surg. 247 An aneurism is generally a pulsating tumour, arising from a dilated, ruptured, or wounded artery, and filled with blood. 1880Günther Fishes 312 Heart replaced by pulsating sinuses. 1891Blackw. Mag. Sept. 322 We throw marked diamonds into the pulsating-pan, and we never fail to recover them. 1912Thiess & Joy Toll Telephone Practice ii. 20 The pulsating current is used in signaling the exchange and the alternating current for calling the various subscribers on the line by means of the usual code rings. 1960H. W. Jackson Introd. Electric Circuits ix. 202 The tendency of inductance to oppose any change in current can be used to advantage in filtering or smoothing variations in load current that would otherwise occur when the load is fed from a d-c source..which provides a pulsating emf. |