mouth off to

Also, not all germs are harmful; we need friendly bacteria that live on our skin to help fight off bad bugs, and bacteria in our mouth and gut help digest our food and prevent illness and disease.

此外，并非所有的细菌都对人体有害；我们的皮肤上需要有“友好”的细菌来帮助抵抗“坏”的细菌，口腔和肠胃里的细菌可以帮助我们消化食物，防止疾病。

She sobbed, and quickly pressed the back of her hand against her mouth to cut it off.

她哭了起来，但她马上用手背按住嘴巴，把哭声压了下去。

Jones, why were you stupid enough to shoot your mouth off all over town about our plan to buy enough stock in that company to take it over?

琼斯，你怎么把我们准备购买那个公司的股票，然后再把它接收过来的计划到处乱说呢。你真是够傻的。