Store the cake in an airtight container.

　　把蛋糕存放在密封容器里。

　　Store the cookies in an airtight tin.

　　將曲奇餅干存放于密封罐中。

　　Store the peppercorns in an airtight container and grind the pepper as you need it.

　　將胡椒粒儲存在密封容器中，在需要的時候磨成粉。

　　Mick had an airtight alibi.

　　米克有確鑿的不在場證據。

　　This means that people going inside must pass through at least two airtight doors.

　　這意味著：人們要進去的話，至少要通過兩道密封門。