basic ball track 球滚动的基本轨迹
double ball track moulding line 双球轨浇注线
Virtual Track ball 虚拟轨迹球
Track the ball 轨迹球
a ball-return track 回珠滚道
track-rod ball plug 横联杆球塞
In this paper influence of geometric excentric ball track of rolling bearing of spindle of machine tool on machining accuracy of workpiece is discussed.
文章讨论了机床主轴滚动轴承滚道的几何偏心对工件加工精度的影响。
If touch isn't your thing, the phone also has a slide-out keyboard that works well enough, as well as five navigation buttons and a track ball.
如果对你来说屏幕不是问题的话，这个手机还有一个工作的够好的滑盖键盘以及五维导向按钮和轨迹球。
Dopamine receptors seem to track possibilities—an arcing tennis ball that may land in or out—and how expected or unexpected they are.
多巴胺受体有着跟踪潜力—网球的弧线球会落在界内还是界外—是怎样期待还是不期待他们的出现。
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