Several problems remain to be solved.
有好几个问题尚待解决。
Several problems remain to be solved.
有些问题尚待解决。
Several problems remain to be solved.
这些问题都亟待解决。
Several problems remain to be settled.
还有几个问题需要解决。
They are now turning their attention to eggs from people, but several problems remain to be worked out.
现在他们开始把注意力投向人的卵细胞，但是仍然有很多的问题需要解决。
Numerous arithmetical problems concern prime numbers and most of them still remain unresolved, sometimes even after several centuries.
大量的数论问题都跟素数相关，它们中的大部分仍然悬而未解，有些甚至过了几个世纪依然无法攻克。
If so, you may be putting yourself at high risk for several serious problems that could affect your health, your ability to remain active, and your risk for injuries.
如果是，可能你把自己置于影响你的健康、影响你的活动能力，以及提高运动损伤等多种严重问题的高风险中。
However, several problems, such as the conservation and distribution of point mutation, remain to be clarified.
但仍有一些问题，如突变的保守性和分布，需要进一步研究、阐明。
However, several problems, such as the conservation and distribution of point mutation, remain to be clarified.
但仍有一些问题，如突变的保守性和分布，需要进一步研究、阐明。
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