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Many water pumps have a spring-loaded seal to avoid leakage of water around the pump shaft.
许多水泵有春天装载的印章在泵桥的周围避免水的漏.
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Many water pumps have a spring-loaded seal to avoid leakage of water around the pump shaft.
许多水泵有春天装载的印章在泵桥的周围避免水的漏.
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