She identifies three forces at work.
她指出有三种力量在起作用。
And these are the only three forces that are on it.
这是物体上，仅有的三个力。
These three forces must eat each other up, so to speak.
这三个力必然互相抵消。
Well, I can think of three or four driving forces.
恩，我能想到的有三四个。
A: Well, I can think of three or four driving forces.
答：恩，我能想到的有三四个。
A: Well, I can think of three or four driving forces.
答：恩，我能想到的有三四个。
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