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That is the background of balance valve and automatic valves been produced.
水力平衡 装置正是在这种背景下产生的。
youdao
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Laughter is one of the body's safety valves, a counter balance to tension.
笑是人体的安全阀，反平衡紧张。
youdao
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Laughter is one of the body's safety valves, a counter balance to tension.
笑是人体的安全阀，反平衡紧张。
youdao