例句：

　　Your needs can differ from day to day.

　　你的需要可能每天都在變化。

　　They're improving day by day.

　　他們?cè)谝惶焯斓馗倪M(jìn)。

　　Day by day his condition improved.

　　他的健康狀況一天天好轉(zhuǎn)。