ball n.球,舞会,球状物vt.捏成...a ball of fortune 受命运摆布的人...ball pen 圆珠笔...ball race 滚珠座圈...hair ball 毛团,毛粪石(胃肠内)...wool ball 羊毛团...keep one's eye on the ball 警惕...ball packing 球(状)填充物...ball float trap 浮球式冷凝水排除器...ball milling 球磨碾磨...game ball 决胜球,决胜分...food ball 植物粪石...radial ball bearing 径向滚珠轴承...ball-point n.圆珠笔...ball peeen hammer 球头锤...keep the ball rolling 使不中断...ball non-return valve 球形止回阀...ball pressure test 球压式试验;球压式硬度试验...ball-thrombus 球状血栓...ball-and-roller bearing 滚珠与滚子轴承,减磨轴承...ball cock 浮球阀球阀;球心阀...
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