动词
中文翻译：密封
同义词：
['stamp', 'seal', 'secure', 'fasten']
例句：
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1. The seal on the envelope is unbroken.
信封上的印章完好无损。
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2. The government sealed off the border to prevent smuggling.
政府封锁边境以防止走私。
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3. The seal of approval was put on the project by the committee.
委员会批准了该项目的印章。