Many problems remain to be solved.
有好多问题尚待解决。
Several problems remain to be solved.
有好几个问题尚待解决。
Several problems remain to be solved.
这些问题都亟待解决。
Several problems remain to be solved.
有些问题尚待解决。
However, some problems remain to be solved on its way of further development.
但在继续前进的道路上，还有一些问题需要解决。
While many old problems still remain to be solved, many new ones are emerging.
很多旧问题需要继续解决，新问题更是层出不穷。
While many old problems still remain to be solved, many new ones are emerging.
很多旧问题需要继续解决，新问题更是层出不穷。
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