大有可为的英文：
sth is well worth doing
have a bright future

There are bright prospects for freshwater fish farming
淡水养鱼大有可为。

He might feel that leveraging the company at a time when he sees tremendous growth opportunities would be a mistake.
他也许觉得，在他认为大有可为的时候让公司借贷经营是一个错误。

average sth out(at sth);calculate the average of sth
算出某事物的平均数

be agreeable to sth
欣然同意某事

at/on the altar of sth
因为，为了（值得为之受苦的事）

Not worth the salt
无能;不称职

If a thing is worth doing it is worth doing well
值得做的事,就要尽力做

to recognize the worth of someone; to appreciate
赏识

Do in Rome as the Romans do
入乡随俗

You do fractions, then you do decimals.
你先学习分数，然后，学习小数。

Do it for this once.
就干这一次吧。