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- A micro ball screw and PWM(Pulse Width Modulation) servo amplifier based on Smart Power IC SPIC are applied in this system. Higher accuracy, band width, linearity, efficiency and linear displacement output are characteristics of the system. 该系统采用了航空精密微型滚珠螺旋副和基于智能功率集成电路（SmartPowerIC－SPIC）的PWM（PulseWidthModula－tion）伺服放大器，具有精度高、频带宽、线性度好、效率高和线位移输出方式等特点。
- Effect of the surface treatment of hollow micro balls used as foaming agent on improving wettability with molten Al and increasing porosity and pore uniformity has been experimentally studied. 实验研究了作为发泡剂的空心微珠经表面处理后对改善与铝液的润湿性，提高发泡铝合金空隙率和空隙均匀度的作用。
- 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。
- 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。
- 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。
- The loss of the ball game stir up much feeling. 球赛输了引起了极大的愤慨。
- 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。
- He swiped at the ball and missed it. 他向球猛击，但未打中。
- How fast does the new micro process the data? 这新微型计算机处理数据有多快?
- The ball hit the wall and bounced off it. 球打在墙上又反弹回来。
- The ball is filled with gaseous mixture. 那个球充满了气体混合物。
- I cut up the meat for cooking meat ball. 我把肉剁碎后做肉丸子。
- He fumbled the ball and then dropped it. 他笨手笨脚的漏接了球。
- He hit the tennis ball over the net. 他把网球打过了网。
- He kicked the ball to the stand. 他把球踢到看台上了。
- The ball glanced off the goal post into the net. 球撞到球门柱上斜飞入网。
- The golfer took a swing at the ball. 打高尔夫球的人挥棒击了一下球。
