士别三日刮目相看的英文：
[Literal Meaning]
sir/leave/three/day, rub/eye/each other/see
One should be given a different look even though there are only three days of separation.

[解释]
指别人已有进步，当另眼相看。

[Explanation]
One has made great progress in a short period of time and should be treated differently.

[例子]
那个农民这么快就从一个文盲变成了能够阅读报纸的人，真是士别三日，刮目相看。

[Example]
The illiterate spent only a short period of time to change himself into one who can read newspapers, which is really amazing and we should treat him differently from now on.

A scholar who constantly makes improvement deserves a new appraisal of his achievements every now and then
士别三日刮目相看