大家都搜:
必须佩戴口罩
1、be must for───必须
2、it must be───它必须是;一定是
3、be worn out───(物)破旧;疲惫不堪;用坏了的
4、that must be───那一定是
5、must be that───一定是那个
6、must be nice───一定很好
7、must be the───一定是
8、be must───必须
9、must be happy───一定很开心
1、gas mask must be worn───必须戴防毒面具——
2、she added: A mask can be worn continuously for up to eight to 10 hours, but must be replaced if it is taken off at any stage.───她补充说:“一只口罩持续佩戴可以达8-10个小时,但是期间一旦摘下就必须更换。”