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。
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。
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。
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。
Wearing surface on orthotropic steel bridge deck is a complicated yet still not well solved technical problem.
正交异性钢桥面铺装技术一直是困扰道路工程界与学术界的难题之一，至今尚未得到妥善解决。
This is a traditional problem, yet it really can not be solved from beginning to end.
这是一个传统的问题，但一直又是一个悬而未解的难题。
This is a traditional problem, yet it really can not be solved from beginning to end.
这是一个传统的问题，但一直又是一个悬而未解的难题。
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