我发现前门大开着时就隐约感觉到出了事。

The first inkling I had that something was wrong was when I found the front door wide open.

《牛津词典》

我刚走上那条街就发现自己迷路了。

Barely had I set foot in the street when I realized I was lost.

《柯林斯英汉双解大词典》

如发现有人形迹可疑，你就告诉我。

Let me know if you see anyone acting suspiciously.

《牛津词典》

And my plan was going along fine until something happened, and what happened was that chemistry was just way more interesting than I anticipated.

但我觉得最好在第一学期就把化学课选了,所以我就这么干了,我的计划一直都很顺利,直到我发现化学比我想象中的要有趣的多。

麻省理工公开课 - 化学原理课程节选

I realize I've given you some difficult mathematics, but--it's not that difficult actually-- but I kind of went through it quickly.

我发现我给了你们一些比较难的数学公式，不过，并不是想象的那么难-,我很快就把它们讲完了。

耶鲁公开课 - 金融市场课程节选

So I'm first going to look for something that's not in the list, I'm going to see, is minus 1 in this list, so it's going to be at the far end, and if I do that in the basic case, bam.

如果我试试第一种最基本的方法,噢，一下就完成了对不对？,因为这种方法查了下第一个元素，然后发现目标数比较下，因为目标数小于第一个元素。

麻省理工公开课 - 计算机科学及编程导论课程节选