What remains unclear is how far this can go before the government reacts to it as a threat.

VOA: special.2010.06.18

So a bit of uninteresting math, a bit of focus on sizes of types, but any questions on syntax or concepts thus far before we now put this to the test?

一些比较无趣的数字，一些关于类型的大小,在我们现在进行试验之前,你们对这其中的语法或概念有什么问题吗？

哈佛公开课 - 计算机科学课程节选

Maybe you should leave before it gets too dark, so that you don't have to walk too far.

也许你该在天黑之前就动身回去了，这样你就不用走那么远了。

How long实战 - SpeakingMax英语口语达人

And even more fundamentally than that, before we get too far down the road of fixing certain problems, how do we do so before we actually identify what those problems are,"

VOA: standard.2009.03.26

Most of us think we have so far to go before we can answer questions like Huxley's question.

多数心理学家与哲学家都认为在能够回答,诸如赫胥黎提出的这类问题之前,还需要做大量的研究才行

耶鲁公开课 - 心理学导论课程节选

So, Lewis structures are really a model for a way to think about what the valence electron configuration is, and as I said, it's not based on quantum mechanics, it's something that Lewis observed far, far before quantum mechanics were discovered.

路易斯结构实际上是一个用来考虑价,电子排布的模型，而就像我说的，它并不以量子力学为基础，而是路易斯在以前发现的,在量子力学出现很早前。

麻省理工公开课 - 化学原理课程节选

It's a good question. As far as Accounting here, it's because I had done Accounting before.

问得好。现在会学会计是因为我之前做过会计。

为什么是会计学呢？ - SpeakingMax英语口语达人

And, in fact, a computer program has come up with a proof that, as far as was known, nobody in the world had ever come up with before.

而实际上,电脑程序的证明方式,据目前所知,是前人们从未曾提出过的

耶鲁公开课 - 死亡课程节选

So what we think we know derives chiefly from archeological evidence, which is before writing--mute evidence that has to be interpreted and is very complicated, and is far from secure.

我们目前所认为的史实,主要都是从考古证据中所得,这些无声的证据出现于文字记录之前,因此就需要繁复的考证及解读,这些考证未必可靠

耶鲁公开课 - 古希腊历史简介课程节选