她密封了罐子，这样果酱就不会变质。

She ___sealed the jars so the jam wouldn't spoil.

在埃及，金字塔正在被密封，因为游客的汗水正在破坏墙上的画。

In Egypt, the Pyramids are being ___sealed, because the perspiration of the tourists was ruining the paintings on the walls.

宇航员在太空行走前密封了舱口。

The astronauts ___sealed the hatch before the spacewalk.