他们在地铁上都戴口罩。

They all wear a mask on the subway.

进入医院前，请戴口罩。

Please wear a mask before entering the hospital.

在医院里每个人都需要戴口罩。

Everyone needs to wear a mask in the hospital.

在公共场所戴口罩是很重要的。

It is important to wear a mask in public places.

医生建议他戴口罩以避免感染。

The doctor advised him to wear a mask to avoid infection.

医生建议我们在流感季节戴口罩。

Doctors recommend that we wear a mask during flu season.

她总是忘记戴口罩。

She always forgets to wear a mask.

在疫情期间，每个人都必须戴口罩。

During the pandemic, everyone was required to wear a mask.

你需要戴口罩来避免吸入喷漆的气味。

You need to wear a mask to avoid inhaling the spray paint fumes.

戴口罩的时候要里外分清；

Inside and tell when you wear a mask;