n.垂直；直立
Mounting inaccuracies in parallelism and perpendicularity during the installation can create uneven loads on the ball screw system, causing abnormal noises. 在平行和垂直方向不精確的安裝可以導(dǎo)致不均勻的載荷，這些會(huì)導(dǎo)致不正常的噪音。
