But once you say the wrong thing and start to tell the secret, there's no going back: you've spilled the beans.

但是，一旦你说错话，开始泄密，便再也无法回头了：你已经说漏嘴了。

youdao

Once or twice I heard her muttering, but when I said, "Sorry? What did you say?" she didn't respond.

有一两次我听见她在嘀嘀咕咕，但当我说“抱歉? 你说什么？”时，她没有回答。

《柯林斯英汉双解大词典》

But once I saw His unconditional love for me, a love unaffected by who I was and all I had done, my heart was able to say, "Father, I love you."

我曾经看到上帝无条件的爱，一种不因为我是谁或者我曾经做什么而受影响的爱，我的心能够说，上帝，我爱您！

youdao

But I will say, once you know your final exams,schedule And, you should know that about October 1.

但我会说，知道你们的期末考试就开始计划吧,你应该知道10月1号。

麻省理工公开课 - 固态化学导论课程节选

Because,indeed,they don't exist They're merely possible And we might say,you've got to exist in order for something to be bad for you But once we say that it seems we're running towards the position that in that case,death can't be bad for me because of course,when I'm dead,I don't exist ? So how can anything be bad for me?

因为他们其实并不存在,他们只是一种可能,我们由此认为你必须首先存在,某事才会让你害怕,但我们一旦这么说,我们似乎会得出这个结论,这种情况下死亡不可能让我害怕,因为我死了就不存在了,所以我怎么会害怕？

耶鲁公开课 - 死亡课程节选

And I hate to say this but, you know, having been to Africa more than once, I would say that I think that the negative aspects of Africa are something that require an urgent attention and perhaps more than the fact that they have interesting animals and vibrant cultures, et cetera.

NPR: Roundtable: Chrysler's Deep Cuts, 'Rebranding' Africa