airtight
adjective uk/ˈeə.taɪt/ us/ˈer.taɪt/
密封的,气密的,不透气的
completely closed so that no air can get in or out
Biscuits will stay crisp if you keep them in an airtight container. 如果装在密封容器里,饼干就会保持酥脆。
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