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- Input devices include keyboards and pointing devices such as mouse,joystick,track ball, or light pen. 输入设备包括键盘和点击设备如鼠标，操纵杆，跟踪球或光笔。
- Input devices include keyboards and pointing devices such as mouse, joystick, track ball, or light pen. 输入设备包括键盘和点击设备如鼠标,操纵杆,跟踪球或光笔。
- -A virtual tracking ball demo of multi-document, trackball. 详细说明： 一个使用虚拟跟踪球的多文档演示程序，trackball.
- Our pilotless rocket enters the track of the earth. 我们把一个无人驾驶的火箭送入了地球的轨道里。
- He singled and went to second on a passed ball. 他击出一垒打，再因对方漏接而跑上二垒。
- In cricket, the ball is delivered overarm. 打板球时，要举臂过肩掷球。
- This rough track will soon be a metalled road. 这条坑坑洼洼的路不久就要铺上碎石了。
- I'm trying to track down my old Aunt Maud. 我正试图寻找到我那年迈的婶婶莫德。
- Children love to ball snow up in their hands. 小孩子们喜欢将雪在手里做成球儿。
- He lay back and hit the ball for four. 他向后弯身击中球，得了4分。
- The cyclist went at full sail along the track. 自行车手沿着跑道全速前进。
- She came out of her room equipped for the ball. 她盛装从房里出来预备到跳舞会去。
- Bill has a feeling he is on a fast track. 比尔感觉到他正快速迈向成功。
- The loss of the ball game stir up much feeling. 球赛输了引起了极大的愤慨。
- The new race track is nearly six miles in extent. 这条新跑道将近六英里长。
- The pitcher tends to pitch the ball too high. 这个投球手常把球掷得过高。
- Smith tied into the ball for a home run. 史密斯猛击球取得本垒打。
- Tracking wild animals requires great stealth. 跟踪野生动物必须悄然无声。
- He swiped at the ball and missed it. 他向球猛击，但未打中。
- The ball hit the wall and bounced off it. 球打在墙上又反弹回来。
