on the fly

Mitt Romney: Obama 'is learning on the fly'
一邊做，一邊學。
誰不是呢?
Well, this probably isn't the right time for it. I line up with Warren Buffett on this. I prefer to see the president focusing all of his time and energy on the economy.
I'm not going to be taking my time taking pot shots at the entire profession of business or any other profession in this country. Except maybe lawyers -- I'm kidding.

take a pot shot at sb/sth
a) to shoot at someone or something without aiming very carefully
b) to criticize someone or something unfairly without thinking carefully about it
胡亂批評
learning on the fly
while dealing with a situation, rather than before dealing with it
一邊做，一邊學
註：Mitt Romney是共和黨上次和Macan競選提名失敗的州長