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。

youdao

So all I'm really interested in here is the idea that we have a duple meter.

我所真正感兴趣的是,我们已经理解了二拍子

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I'm standing at the starting line of the girls' 100-meter dash, watching my 12-year-old crouch for the start.

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"I'm not invincible, " he told BBC Sport after his 100 meter stroll, easing down as he crossed the line in his trademark style.

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