time-shift phase difference
time-shift phase difference
时移相位差
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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When the pressure difference changes with time, a phase shift will occur between the transient pressure difference and displace of valve flap, which could cause leakage and even reverse flow.
当阀片两侧的压差随时间变化时，阀片的启闭与压差的变化之间存在一定的相位差，有可能引起泄漏甚至反向流动。
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