youdao

Use wet clothes to cover your mouth and nose. Always use stairs don't use elevators.

用湿衣服盖住口鼻。尽量走楼梯，不要乘电梯。

youdao

When there's a fire, follow the teachers' instructions, leave the classroom quickly and use a piece of cloth to cover your mouth and nose so that you don't breathe in smoke.

发生火灾时，按照老师的指示，迅速离开教室，用一块布遮住口鼻，以免吸入烟雾。

youdao

Frank DiPaolo says you should use either a white or a black cover.

VOA: special.2011.06.14

Now I use this to cover some phrase because I'm not here talking about rejecting the existence of souls.

在此我不打算多加赘词,因为我不是来这讨论,是否该拒绝承认灵魂的存在的。

耶鲁公开课 - 死亡课程节选

And so, it would be a shame for me not to use them to cover some of these issues.

如果不能请到他们来帮助我教授这些主题,那可就太可惜了

耶鲁公开课 - 心理学导论课程节选

It also would probably allow the Turks to use this as cover to - and I think that this is a possibility, is they'll use this as cover to - we are now going to pass a law that says we can, in fact, go into northern Iraq.

NPR: Turkey Rattles Sabers at Kurdish Iraq

Zoos and animal amusement attractions use the cover of "science" to justify their shows.

CNN: Free the killer whale

These widgets make extensive use of cover art, so they are colorful and attractive.

CNN: Review: Nexus 7 is best Android tablet yet