We can thank Shakespeare for committing the phrase "Carry your heart on your sleeve" — or being transparent — to paper. Iago famously says it in "Othello."
我們應該感謝莎士比亞，因為是他將“把心戴在袖子上”（carry your heart on your sleeve）寫在紙上，意思是輕易表露感情，是《奧賽羅》中伊阿古的名言。

In Othello Act 1 Scene 1, Iago says “But I will wear my heart upon my sleeve…” meaning he would be exposed.
《奧賽羅》第一幕第一場，伊阿古說：“但是我會把心戴在袖子上”，意味著他會敞開心扉。

Aside from Shakespeare's genius brain, other possible origins include the tokens knights would wear from ladies during jousting matches and a marriage festival from the Middle Ages.
除了天才的莎士比亞，這句話還有可能來源于中世紀馬上長矛比武中貴婦贈與騎士令牌，或婚禮場合，等等。