Had I but rejoiced when I had reason to do so!

当我有理由高兴的时候，我要是高兴就好了！

youdao

Two lawyers were told not to leave the building but no reason for this instruction was given.

两位律师被告知不要离开这座建筑，但没被告知这一指示的原因。

《柯林斯英汉双解大词典》

He confirmed that the city had been closed to foreigners, but gave no reason why.

他证实这座城市已经禁止外国人进入，但没有给出原因。

《柯林斯英汉双解大词典》

But Ms.Smith says the voter registration process may be one reason why young people are less likely to vote.

VOA: special.2010.10.28

One reason for this is obvious; it's cheaper not to pay people, but the other reason is more interesting.

这样做的其中一个原因很明显;,不用付钱，当然就能省点了，但另一个原因更有意思。

耶鲁公开课 - 心理学导论课程节选

But when I review the evidence, I come away thinking there's no good reason to move beyond the physical.

但当我考察这个证据时,我认为,没有比物理证据更好的理由

耶鲁公开课 - 死亡课程节选

Two, those aspects of a transaction subject to human reason are not subject to any human reason, but to the reason of a Shariah authority.

CENTERFORSECURITYPOLICY: Shariah��s Black Box

We only had to give seven days notice but it stands to reason there would be a mopping up time towards the contract.

BBC: Basildon Council litter patrols stop after contract ends

Sure, it isn't as bad as the bug that completely disables the lock screen -- identified on the Galaxy S III, but also found to work on the Note II -- but is just another reason to hope the mythical box is almost empty and at the bottom lies a fix.

ENGADGET