动词短语
中文翻译：在密封之下
同义词：
['be underseal', 'be sealed under', 'be sealedup']
例句：
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1. Thedocuments were carefully placed under the seal ofthe government office.
这些文件被小心翼翼地放在政府办公室的封印下。
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2. The boxwas sealed under a heavylayer of dust.
箱子被厚厚的灰尘封住了。
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3. The secret was kept underseal until the meeting began.
秘密被保密，直到会议开始。