Valve must be able to seal close.

阀门必须能够密封关闭。

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Folds of skin cover their eyes and ears to prevent water from entering, and the nostrils close with a watertight seal.

皮肤的皱褶盖住它们的眼睛和耳朵，防止进水，它们的鼻子内有可关闭的防水封垫。

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When people wanted to send a letter, they would close the paper with a seal.

当人们想寄信时，他们会在信纸上盖封口章。

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Murray also said that he has already filed paperwork with federal regulators to permanently close and seal the Utah mine.

CNN: Crews prepare for final rescue effort at Utah mine

Tom Court went over from close range to seal the bonus point and Doug Howlett's try gave Munster hope before Andrew Trimble's late try sealed the win.

BBC: Munster 11-37 Ulster

The Lib Dems have said the contest - the first by-election battle of this Parliament where the two governing parties are going head to head - is close and they hope to "seal the deal" over the coming days.

BBC: Eastleigh by-election 'two-horse race' claims Nick Clegg