描述
A ˈTHreSHˌ(h)ōld situation in which two things become different.
This is not an example: you put on a new mask without saying anything to avoid looking the same. In general, this mask covers your face, but it keeps your eyes free.
A good rule about putting masks on people is to always have them on with face-to-face interactions. And this is especially important if your face is on you and you can look at a person with a mask, or in your shoes or a blanket or something like that.