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。

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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。

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There isn't a guidance method of evaluating luminous efficacy of light sources on road lighting yet resulted in the problem has not been solved at present.

由于目前国内尚缺乏定量地评价道路照明光源相对光效的指导方法，导致此问题一直悬而未决。

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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.

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