dayinanddayout是什么意思

day in and day out[英][dei in ænd dei aut][美][de ɪn ənd de aʊt]日复一日; 天天地，每天地; 日以继夜; 例句:If you're doing the same thing day in and day out, where would the challenge be?如果你每天重复同样的事情，怎么会有挑战呢？