In order to reach this limit a number of technical problems will have to be solved.

为了达到这个限度，有许多技术问题得解决。

《柯林斯英汉双解大词典》

What are the big problems that have to be solved?

必须解决的大问题是什么呢？

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The meeting may be prolonged into the evening because so many problems have to be solved tonight.

会议可能要延长到夜里，因为今晚有太多问题要解决。

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"I admit that there are several problems that still have to be solved, " says Russell.

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And this is just one of dozens of very important problems that have to be solved for enterprises to embrace the future.

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Indeed, for all the efforts of governments and central banks, many of the global economy's long-term problems have yet to be solved.

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