lever
/ˈlɛv.ɚ/ 名词 C1中文： 杠杆
- A rigid piece which is capable of turning about one point, or axis (fulcrum), and in which are two or more other points where forces are applied; — used for transmitting and modifying force and motion.
- Specifically, a bar of metal, wood or other rigid substance, used to exert a pressure, or sustain a weight, at one point of its length, by receiving a force or power at a second, and turning at a third on a fixed point called a fulcrum. It is usually named as the first of the six mechanical powers, and is of three kinds, according as either the fulcrum F, the weight W, or the power P, respectively, is situated between the other two, as in the figures.
- A small such piece to trigger or control a mechanical device (like a switch or a button).
- A bar, as a capstan bar, applied to a rotatory piece to turn it.
- An arm on a rock shaft, to give motion to the shaft or to obtain motion from it.
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Still kneeling upon the floor he bent forward and threw all his weight and strength upon some lever, with the result that there came a long, whirling, grinding noise, ending once more in a powerful click.
“I made myself some; and with the exception of a file, I have all that are necessary,—a chisel, pincers, and lever.”
More than a year had been consumed in this undertaking, the only tools for which had been a chisel, a knife, and a wooden lever; Faria still continuing to instruct Dantès by conversing with him, sometimes in one language, sometimes in another; at others, relating to him the history of nations and great men who from time to time have risen to fame and trodden the path of glory.
Dantès went and cut the strongest olive-tree he could find, stripped off its branches, inserted it in the hole, and used it as a lever.
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