circumference direction backlash
When described as a distance of an arc on the engagement pitch circle, it is called "Circumference Direction Backlash", when described as the shortest distance between two opposing tooth surfaces is called "Normal Line Backlash".
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circumference direction backlash
圆周方向间隙
以上为机器翻译结果，长、整句建议使用 人工翻译 。