1、
The transmission of ball bearing makes the machine running smooth with Iow noise and long life.
球形轴承传动使机器运转轻滑、噪音低、经久耐用.
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2、
A long tapered rod leather tip used to strike the cue ball in billiards and pool.
弹子球或台球中用来撞击母球的尖细的杆子.
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