I make it very simple — I make the length one meter, and I hang on the rod, at the bottom, a mass m, which, let's say, is 500 kilograms.
为了简单-，假设长度为一米，我握住这棒子，底部挂质量M的物体，重为500公斤。
The molds are turned over and a rod lightly taps them on the bottom to allow the chocolates to fall out without being broken.
模具被拿掉，用杆子从底部轻轻敲打它们使得巧克力从模具中调出不被损坏。
Sensors on the top and bottom of the rod constantly monitor the heart.
在杆的顶部及底部的传感器，不断的检测心脏。
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