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Hydraulic equipment or machinery involves or is operated by a fluid that is under pressure, such as water or oil.
The boat has no fewer than five hydraulic pumps.
这艘船有不下5个液压泵。
Below 400–500m, depth does not appear to be related to hydraulic conductivity.
在400-500米之下，深度似乎与水力传导率没有关系。
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