Air pollution will remain a problem for a long time, though we have done a lot to solve it.

尽管我们已经做了很多工作来解决空气污染问题，但它在很长一段时间内仍将是一个问题。

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But secondary schools remain a problem.

但是，中等教育仍然是一个问题。

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Despite all this, the cities remain a problem.

除了上述之外，城市依然是个问题。

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"If Wembley were going to remain a problem, then we would have real difficulty, " he admitted.

BBC: Wembley redesign call dismissed

Yet, taxes remain a problem, especially for imported auto parts that go into the vehicles.

FORBES: Why Chryslers Are So Crazy Expensive In Brazil

While cheating will remain a problem within the cartel, few members want to disregard its rules entirely.

ECONOMIST: OPEC