英语语法分析

Wear a face mask and receive body temperature check before entering the office building.

在进入办公大楼前应佩戴口罩，并接受体温检查。

Should I buy a face mask just in case?

我需要买口罩以防万一吗？

If it's very cold, consider wearing a face mask or scarf to warm the air before it enters your lungs.

如果非常冷，可以考虑戴口罩或者围巾以使空气温暖的进入肺。