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来源:雅诚德英语网
Because there is no abrasion between the concave and convex, the nut is reusable.
由于凹面与凸面之间没有磨损,螺母可以重复使用。
Because there is no abrasion between the concave and convex, the nut is reusable.
由于凹面与凸面之间没有磨损,螺母可以重复使用。