信封是用胶黏带封口的。
我们的一贯做法是，我给她看那个已封口的信封，信封上写着一个声明——她21岁时就可以阅读这封信。
Our tradition is that I show her the sealed envelope, with the 6 proclamation written on it that she may read it when she is 21.
1987年，国家地理协会的一组工作人员来在地下室封口的一块石灰石上钻孔，安装了一个录像机。
In 1987, a team from the National Geographic Society drilled a hole through one of the limestone blocks sealing the chamber from above, and inserted a video camera.
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