A:Why did Tom get promotion again?
B:He always works so hard. He did not leave until 9 o'clock.
A:You have put your finger on it. After all he has spent much more time on work than us.
He did not leave until 9 o'clock.
You have put your finger on it.
After all he has spent much more time on work than us.
put one's finger on something 说话说到要害；说到点子上
Something is wrong with this room,but I can't put my finger on what it is.
We just couldn't put our fingers on what had changed about her.
spend some time on... 花时间做某事
You'd better spend your time on some worthwhile reading.
It was not until next day that I learned the truth.