YSK: If you're sending anything solid in an envelope by mail (cards, drivers license, rings, money, etc) you should tape it to a piece of paper
from /r/YouShouldKnow
YSK: 如果你要用信封邮寄任何固体的东西（卡片、驾照、戒指、钱等），你应该把它粘在一张纸上。
YSK: 如果你要用信封邮寄任何固体的东西（卡片、驾照、戒指、钱等），你应该把它粘在一张纸上。
YSK: If you're sending anything solid in an envelope by mail (cards, drivers license, rings, money, etc) you should tape it to a piece of paper
from /r/YouShouldKnow