Not because I 'm perfect…

并不是因为我完美无暇…

youdao

So any time I draw these molecular orbitals, I do my best, and I'm not always perfect, yet trying to make this energy different exactly the same for the anti-bonding orbital being raised, versus the bonding orbital being lowered.

所以我在画这些分子轨道的时候，虽然不是很完美，但我总是尽量,让反键轨道引起的，能量升高和成键轨道。

麻省理工公开课 - 化学原理课程节选

And I tell you what, back in 2008, I used to say to folks, look, I'm not a perfect man -- you can ask Michelle. (Laughter.) And I tell folks, I'm not -- I won't be a perfect President.

WHITEHOUSE: The White House

I'm not a perfect man -- Michelle can tell you that. (Laughter.) But you know what I did say?

WHITEHOUSE: Remarks by the President at a Campaign Event

' I'm not sure the Romney campaign is in such perfect health they can keep taking aspirin and vitamin supplements and expect to win the presidency.

WSJ: Romney VP Choice: Mild or Spicy?