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union /ˈjuːniən/ n

中文：活接头

中文 · 活接头Español · uniónFrançais · raccord union
Meaning：Formed by using a nut to tighten a male union nut in a female union nut; leakage is prevented by placing a gasket where the two tubes meet.
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Found in these illustrated scenes（1）

Pipe union

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