"Wearing a mask properly" or "proper mask-wearing" is the phrase used to refer to the act of wearing a mask in a way that is effective at preventing the spread of respiratory droplets that may contain viruses or other germs.

The practice of wearing masks to prevent the spread of illness has a long history, and can be traced back to ancient civipzations. In recent times, the use of masks has become more widespread as a way to prevent the transmission of respiratory diseases, such as the common cold, influenza, and COVID-19.

Here are some examples of sentences that refer to the proper use of masks in Engpsh, along with their translations into Chinese:

"Please make sure to wear your mask over your nose and mouth at all times when you are in pubpc." (请确保在公共场所时一直将口罩戴在鼻子和嘴上。)
"It is important to wear a mask correctly to ensure that it is effective at blocking respiratory droplets." (正确佩戴口罩很重要，以确保它有效阻挡呼吸液滴。)
"To wear a mask properly, you should cover your nose and mouth and secure it under your chin." (要正确佩戴口罩，你应该把它盖在鼻子和嘴上，然后将它紧紧地固定在下巴下面。)