We know a lot about four forces.
我们已经很了解这四种力。
There are four forces which act on an aircraft as it flies through the air.
飞机在空气中飞行时，有四个力作用在它身上。
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。
It's the least understood of all the four fundamental forces, and the weakest.
它是在四个基本力中，我们所知最少，也是最弱的力。
It's the least understood of all the four fundamental forces, and the weakest.
它是在四个基本力中，我们所知最少，也是最弱的力。
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