This is minus one over r, so I get m MG over r with a minus sign, and that has to be evaluated between infinity and capital R.
这是r的负值，所以在mMG/r上加-号，它处于,无穷远和R之间。
I 've had so many falls that I' m black and blue all over.
我跌倒多次，弄得全身青一块紫一块。
I 've had so many falls that I' m black and blue all over.
我跌倒多次，弄得全身青一块紫一块。
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