青出于蓝而胜于蓝的英文：
[Literal Meaning]
indigo blue/out/of/blue/aux./excel/than/blue
Indigo blue is extracted from the indigo plant, but is bluer than the plant it comes from.

[解释]
青从蓝草中提炼出来，但颜色比蓝草更深。比喻学生超过老师。

[Explanation]
to surpass one's master or teacher in learning

[例子]
青出于蓝而胜于蓝。要相信年轻人一定会比我们这些老家伙做得好的。

[Example]
Blue from indigo plant is deeper than its origin. We should believe that these young guys will do better than we these old-timers.

The pupil outdoes the master.
青出于蓝而胜于蓝。

Blue is extracted from the indigo plant but is bluer than it; The pupil learns from and outdoes his teacher
青出于蓝而胜于蓝