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- 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。
- And optimum formula was obtained.Influence of hollow micro glass bead and emulsions on reflectivity was discussed.And comparison tests of perform... 乳液品种对涂料反射率影响不大,确定了最佳配方,并对其性能进行了对比测试。
- 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。
- A tennis ball is hollow,but a base ball is solid. 网球是空心的，但棒球是实心的。
- Our team beat them hollow by four clear goals. 我们队以净胜4分彻底击败了他们。
- 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。
- The bell, when struck, gave forth a hollow sound. 敲这钟时发出一种闷哑的声音。
- Children love to ball snow up in their hands. 小孩子们喜欢将雪在手里做成球儿。
- His protests on human rights sound hollow. 他就人权问题提出的抗议听来很空洞。
- 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。
- A round hollow in a hillside; a cirque. 盆地山区中的圆的洼地
- 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。
- She held the small bird in the hollow of her hand. 她把那小鸟握在掌心里。
- Smith tied into the ball for a home run. 史密斯猛击球取得本垒打。
- Let's have a picnic down in the hollow. 咱们到下面的山谷去野餐吧。
- We heard a hollow boom of thunder. 我们听到低沈的隆隆雷声。
- He swiped at the ball and missed it. 他向球猛击，但未打中。
