closed ball nest theorem 闭球套定理
closed-circuit ball mill 闭路球磨机
closed unit ball 闭单位球
the closed unit ball 闭单位球
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If you practice kicking a soccer ball with your eyes closed, it takes only a few tries to become quite good at predicting where the ball will end up.
如果你闭着眼睛练习踢足球，仅仅只需几次尝试就能很好的预测球的最终方位。
When a ball valve is closed in periods of inactivity, the bleach will decompose over time liberating oxygen gas.
当球阀在不工作期间关闭，经过一段时间，漂白剂将分解并释放出氧气。
Gas pressure may slowly build in the closed valve cavity, or quite rapidly in the reactive case. There are confirmed reports of ball valve structural failures.
气体压力可能会在封闭的阀腔内慢慢积累，或者在反应情况下相当迅速地积累，这是就极可能产生阀门故障。
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