But some people have become concerned about other kind of pollution.

但是，有些人开始担心其他类型的污染有关。

youdao

Over the years, though, scientists have become concerned about its possible health effects.

尽管如此，多年来，科学家们已经在担心其可能的健康影响。

youdao

However, scientists have become concerned about the hormone's long-term effects on our health.

然而，科学家们开始对激素对我们的健康产生的长期影响感兴趣。

youdao

However,scientists have become concerned about the hormone's long-term effects on our health.

VOA: special.2009.03.24

What he proposes is that we have become so precise about nutrients, and so concerned about the things that are in food, we've lost sense of what food is.

他认为我们越来越关注营养,关注存在于食物当中的物质,却忽略了食物本身

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

But we need to become more concerned about global warming, pollution,

我们需要更多关注全球变暖、污染问题，

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However there is the potential for a domino effect if citizens become concerned about their banks.

FORBES: Cyprus: Test Case for Leaving the Euro?

The captain had become concerned about a possible technical problem with the "engine reheats" on the aircraft.

BBC: Concorde

But now the economics establishment has become concerned about who gets what.

ECONOMIST: For richer, for poorer