The parallel meshing of several gears under load permits a compact construction.
承载齿轮的平行啮合使行星轮系结构较紧凑。
During traditional helical gears of parallel axle with external engagement engage, the direction of rotation is converse.
传统的平行轴外啮合斜齿轮在啮合传动过程中，两齿轮的转动方向是相反的。
And in the case of bevel gears, the rotational axes are not parallel to each other.
在斜齿轮情况下，并且，旋转的轴不是互相平行的。
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