day by day跟day after day的区别?

day by day和day after day在意思上区别不大,一个意为逐日、日渐,一个意为日复一日.
其差别主要在用法上.
1.day by day强调程度的递变,强调有变化.(含有越来..越..之意）
His English gets better day by day.
2.day after day用于形容动作的重复.（不含变化的意思）
He goes to look after his grandfather day after day.
(他天天都去看他的祖父）