Grinding head on, sliding imports of dual-use system linear guide, two-ball screw drive, to achieve the smooth running speed to eliminate mobile space (displacement).

磨头座、滑动系统采用进口的双直线导轨、双滚珠丝杆传动，以达到运行速度平稳、消除移动间隙(位移)。

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The wheelchair tennis player is allowed two bounces of the ball.

残疾网球运动员可以有两次弹球的机会。

《柯林斯英汉双解大词典》

Soccer needs only two feet and a ball.

足球只需两只脚和一个球。

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He has a little ball. A little two- or three-year-old kid has a ball.

他有一个小球，一个两或三岁的孩子有一个球。

耶鲁公开课 - 1945年后的美国小说课程节选

Another problem: a lawsuit claiming it stole the design for the hot-selling Two-Ball Putter. (Callaway says it bought the design fair and square from another party.) And even the luster of celebrity endorsers, including top golfer Annika Sorenstam , are little help against new rival Nike (nyse: NKE - news - people ), whose high-tech products and spokeschampion Tiger Woods are luring customers.

FORBES: Magazine Article

Bowling with a wet ball, with the match having been played entirely in heavy drizzle, Franklin delivered two no-ball beamers and was taken out of the attack after five balls.

BBC: SPORT | Cricket | Counties | Gloucestershire make last eight

But he nearly matched Kuroda, who pitched two-hit ball for eight dominant innings, for the first six.

WSJ: Blue Jays' Buehrle loses to Yankees again, 5-0