The researchers don't make causal links, though they caution that loud sound exposure from listening to music might be particularly significant to adolescents.

尽管研究人员警告，对青少年听力损伤问题而言，听音乐时喧闹外放的声音非常关键，但他们仍未确定其中的因果关系。

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But they caution that the study covers less than a quarter of world fisheries, and lightly to moderately fished and rebuilding ecosystems comprise less than half of those.

但是他们提醒说，研究只涵盖了世界不到四分之一的渔场，少量或适度捕捞并正在恢复的生态系统不足其中的一半。

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However, they caution that there are likely to be other ways that cancers can develop resistance.

然而，他们也警告说癌症有可能是以其他方式来产生耐药性。

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They caution that the company's plans are still in the early stages and could change.

WSJ: Apple's Silence Feeds Talk of New Gadget

Scientists not involved with the study were also enthralled by the results, although they caution that the study is small and the results are preliminary.

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While they caution that any changes would be relatively modest, particularly near the capital's monuments, their proposal has reactivated a debate that has come and gone over the years, pitting preservationists against advocates of more growth.

WSJ: Is It Time for D.C. to Grow Up?