The threat they could pose if they crash and what would happen in bad weather.

如果风筝坠毁可能会发生危险，且在恶劣天气下风筝的状况也是未知数。

But a lot is still unknown as more and more countries shut this region off.

但随着越来越多的国家针对地区关闭国境，仍然存在很多未知数。

When the Grand Duchess will come to Moscow is still unknown.

而何时能在莫斯科上映还是个未知数。

Jack is too much of a wild card to get a place on our team.

杰克是个未知数，可能在我们队中获得一席之地。

And it is not clear when they will, the Associated Press reports.

此外，据美联社报道，何时方案目前仍是未知数。

But at the moment we still don't know.

但目前这仍是未知数。

But there are a lot of unknowns.

但还有很多未知数。

Can tomorrow's sand flow through the glass before today's?

明天是一个未知数，为什么要把今天的精力浪费在未知的事上？想着明天的种种，今天的时光也白白流逝了。

No. I mean, not really. We are in uncharted territory here in Kenya.

知道，我们清楚。这在肯尼亚是个未知数。

But either way, since Descartes' time, it's been the unknown that mathematicians love the most.

但管怎样，从笛卡尔时代开始，数学家们最爱的就是未知数。

How they all fit into the ocean ecosystem is a big unknown.

它们如何融入海洋生态系统是一个很大的未知数。

How the felines got infected is still unknown.

猫科动物是如何被感染的还是个未知数。

You know, still so many unknowns about how it would affect children.

您知道，关于新冠如何影响孩子，仍有很多未知数。

Whether such compromise is even possible in Britain's polarized politics is unclear at best.

然而，在政治两极分化的英国，这种妥协是否真有充其量也只是个未知数。

How much Syed can count on Tunisia's security forces is another unknown.

赛义德能在多大程度上依赖突尼斯的安全部队则是另一个未知数。

What happens next and who will lead the country now is uncertain.

至于接下来的局势以及谁将领导这个国家，现在还是未知数。

Five days after Kenya's election it's still uncertain who the next president will be.

肯尼亚大选开始五天后，谁将成为下一任总统仍是未知数。

But the future of the grapefruit is unknown.

但是葡萄柚的未来还是未知数。

Well, we don't know any of that for sure.

现在一切都还是未知数。

What this microbial coup will do to the planet's ecological health is not known.

微生物的这种政变将对地球生态健康有何影响，现在还是未知数。