Second grade buy mask count message note write the address, body, signature, and date, and write the three words of the message right in the middle of the first line.

The mask is a hygiene product, generally refers to wear in the mouth and nose parts used to filter the air entering the mouth and nose, in order to block harmful gases, odors, droplets in and out of the wearer's mouth and nose of the appliances, made of gauze or paper, etc..