airtight

adj.

1. 不透气的, 密封的
   • The police verified that she had an airtight alibi.
     警方查明她有着无懈可击的不在犯罪现场的证据。
   • Biscuits will stay crisp if you keep them in an airtight tin.
     如果你把饼干放到一个密闭的铁罐里, 它就会保持松脆。