He had to drop out of the race because his leg was injured.
因?yàn)樗哪_受傷了,他不得不退出比賽。
drop out 有退出和退學(xué)的意思。
He dropped out of school when he was fifteen.
他15歲時(shí)退學(xué)了。
如果drop out連成一個(gè)單詞,寫成dropout或drop-out,就變成一個(gè)名詞,意思是退學(xué)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(xué)生交朋友。