principle of lever 杠杆原理
He thinks that Chopstick used the principle of lever and what hands can do.
他认为，筷子使用的原则，杠杆和手可以做什么。
There are still applied physics of lever principle.
这里边还运用了物理学中的杠杆原理。
A nanometer system for displacement measurement is described, which is based on the principle of optical lever.
介绍了一种基于光杠杆原理的光学微位移测量系统。
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