Synchronized Motion: Two opposing pistons share a common bore.
同步运动：两个对立活塞都有一个共同的孔。
By friction is meant a force opposing motion.
摩擦力指的是阻碍运动的一种力。
The motion and change of things in the natural world abide by a unified law of opposing and supplementing each other.
自然界中万事万物的运动变化都遵循着相互依存、相互消长、相互对立的统一规律。
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