He developed a strong character after his parents'death.

遭逢大故,他变得坚强了.

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His family was broken up by a grave incident many years ago.

多年前的那场大故,使他妻离子散.

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Water Ring Pump impeller mixing liquids as a result of loss of energy, and therefore inefficient.

水环式真空泵由于叶轮搅拌液体,损失能量大, 故其效率很低.

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