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He had to drop out of the race because his leg was injured.
因為他的腳受傷了，他不得不退出比賽。
drop out有退出和退學的意思。
He dropped out of school when he was fifteen.
他15歲時退學了。
如果drop out連成一個單詞，寫成dropout或drop-out，就變成一個名詞，意思是退學生。
His mother doesn't want him to be friends with those dropouts.
他的媽媽不想他和那些退學生交朋友。
