A pair of meshed crossed helical gears usually have the same hand; that is, a right-handdriver goes with a right-hand driven.
一对网状交叉斜齿轮通常有相同的,另一方面,那就是,一个右手边的司机云与右手边的驱动。
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For instance, if a car driver slows down to let you cross the road, simply raising your hand in acknowledgement is enough to show that you appreciate the driver's consideration.