There are also the opportunity costs: what cures for disease, what other useful discoveries might we never know of, because a habitat is destroyed forever, or land is polluted beyond all use?

还有所谓的机会成本：什么东西能够治愈疾病，还有其他有用的新发现，也许我们永远不会知道，因为栖息地被永远破坏，或土地被污染而没法使用。

youdao

But we also say thank you because we want the other person to know we value what they've done for us and, maybe, encourage them to help us again in the future.

但我们跟别人说谢谢是因为我们想其他人知道我们珍惜他们为我们所做的一切，或许，鼓励他们在未来继续帮助我们。

youdao

I know many people will say we were successful because we used this new type of IVF, but I also like to think we chose a propitious time.

我知道很多人认为我们之所以成功，是因为采用了最新的人工受孕技术，但我还是认为我们选择了一个正确的时间。

youdao

We know that because they also have a writing which we can read, and it speaks of it as well as the archeological remains that show destruction.

他们有文字,所以我们能了解这些内容,手稿和古代遗址一起,诠释了那场劫难

耶鲁公开课 - 古希腊历史简介课程节选

So delta u is just equal to the work but we also know what happens T2 because the temperature is changing from T1 to T2.

所以Δu等于输出的功,但我们也知道它会发生,同时我们知道温度从T1变到。

麻省理工公开课 - 热力学与动力学课程节选

In a sense we're safer because we know what's going on and we're also more effective because we work so closely with them.

NPR: Training Troops to Police a Volatile Iraq

We also know that their ideas don't -- because we tried their ideas, too.

WHITEHOUSE: The White House

And it's also not an opportunity of the day because we know this is a multiyear battle.

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