What are these two issues?

这两个问题是什么？

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These two issues have caused controversy abroad.

这两个问题在国外曾引起争议。

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Once these two issues were identified, we began to investigate the situation.

发现这两个问题之后，我们开始调查情况。

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The combination of these two issues has proved a significant hindrance to the mission.

BBC: NEWS | Science/Nature | Asteroid probe 'did touch down'

And these two issues come together with extra urgency on America's two long borders, with Canada and Mexico.

ECONOMIST: America's border troubles, north and south | The

These two issues are basically childhood diseases that stem form the fact that, right now, the user base is nothing compared to entire population.

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