The flu is going around now. How are you all doing? This year, the outbreak began earlier than usual, and classes at the school attended by a friend's child have already been closed. I can't help but wonder, "How many times will classes be closed this year...?" This time, as the title suggests, "MASK" I wrote about it. When do you use it? ・At work ・The room is a little dry ・Uncomfortable feeling in the throat ・At bedtime We use: Always wear a mask when it is required. Com