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acorn nut /ɐsˈɛtəlˌiːn ˈvalv/ n

中文：盖形螺母

中文 · 盖形螺母Español · tuerca cerradaFrançais · écrou borgne
Meaning：Nut capped with a hollow dome that covers and protects the threaded end of the bolt.
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Nut

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