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lock nut /ˈlɒk ˈnʌt/ n

中文：锁紧螺母

中文 · 锁紧螺母Español · contratuercaFrançais · bague de blocage
Meaning：Part for tightening the joint between the draining circuit and the end piece.
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Found in these illustrated scenes（4）

Sunshine recorder Micrometer Micrometer Garbage disposal sink

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