head start
an advantage granted or achieved at the beginning of a race, a chase, or a competition because you start early before the official or typical time
因为开始地比较早，在比赛开始时便拥有优势
Billy liked to get a head start on his homework before leaving school so he had more time to play with his friends when he got home.
比利喜欢在离开学校前就开始做作业，这样他回家后就有更多的时间和朋友一起玩。
She took some extra classes to get a head start in her career.
为了能够在事业上抢占先机，她参加了一些额外课程。
