不知道

We just don't know when, and the when is critical economically and politically.

但是我们不知道哪时候才会开始，也不知道哪时候才是政治和经济的关键时刻。

She isn't a person who is really that to the point and efficient.

我不知道：她也不知道：我收到的她，叫李宇春，就是现在站在你们面前的这个人。

I'm not sure I want to know it, eh?

我不知道我是不是很想知道

You don't know it, I don't know it, either.

你不知道这件事，我也不知道。

I don't know what more we could have done to try to win this election.

我不知道。不知道我们还要再做什么，才能赢得这场选举。

If you don't know what to do or how to do , please ask your employer first

如果你不知道该做什么活是不知道怎么做，先问问你的雇主

Dretske thus concludes that we should instead allow that an agent might be able to know while failing to know, and thus, given that the entailment is known, that closure fails.13

Dretske 于是结论说，我们应该允许一个人能够知道但不知道，于是，假定蕴涵是被知道的，那么闭合原则就是假的。

Eric: I don't know. I don't know!

我不知道。我居然不知道！

Although we know neither where the lemon was first grownnor when it first came to Europe,we do know from its name alone that it came to us from the Middle East,because we can trace its etymological path.

虽然我们既不知道柠檬是在哪儿被最早种植的，也不知道它是什么时候传到欧洲的，但是我们却能单从它的名字确切地判断出它是从中东地区传到我们的，因为我们可以追溯出它的语源的发展道路。

Although we know neither where the lemon was first grown nor when it first came to Europe, we do know from its name alone that it came to us from the Middle East, because we can trace its etymological path.

虽然我们既不知道柠檬是在哪儿被最早种植的，也不知道它是什么时候传到欧洲的，但是我们却能单从它的名字确切地判断出它是从中东地区传到我们的，因为我们可以追溯出它的语源的发展道路。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。