我还在这边开会。
M: Hmm. How in the world did you climb up here?
玛：你究竟怎么爬上来的？
In the most simple case that I can think of, I have here a block m which has a certain mass, m.
在最简单的示范中，我有一个大块，它的质量为。
In the most simple case that I can think of, I have here a block m which has a certain mass, m.
在最简单的示范中，我有一个大块，它的质量为。
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