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air relief valve /ˈeə ɹɪlˈiːf ˈvalv/ n

中文：排气阀

中文 · 排气阀Español · válvula de liberación de aireFrançais · dégagement d’air des citernes
Meaning：Device that allows air to escape as oil fills the tanks to displace it.
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Found in these illustrated scenes（2）

Oil tanker Oil tanker

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