Astronomers have not yet fully solved the problem of what a black hole is.

黑洞是什么，天文学家还没有完全解决这个问题。

youdao

The calibration of mass spectrometers for partial pressure remains a problem which has not been solved completely yet.

分压力质谱计的校准是一个没有完全解决的难题。

youdao

How to deal with excess sludge effectively in biological disposal of organic waste water, which is a cosmopolitan problem that not solved yet.

如何对有机废水生物处理中产生的剩余污泥进行经济有效的处理，是一个世界性的尚未解决的问题。

youdao

Either way, Sir Mervyn noted that Greece has a solvency problem that has not yet been solved.

BBC: Why UK banks are not immune to eurozone woes

Prof Larson thinks MIT's Media Lab has solved a problem that does not even exist yet.

BBC: What if a robot drove your car?

North Belfast MP Nigel Dodds said he hoped a community forum proposed last year, which has not yet formally met, could help solved the problem.

BBC: Tight security as schools reopen