However, the researchers caution that their study, while observing a real effect, has limitations.

然而，研究人员警告称，他们的研究虽然观察到真实的效果，但具有局限性。

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The researchers caution that the study was limited to people of European descent.

研究人员提醒说，这项研究仅限于欧洲血统的人。

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Not all of these wage differences are due directly to sleep, the researchers caution.

研究人员提醒道，并非所有的工资差异都由睡眠直接导致。

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While it might be tempting to try to reduce your own risk by popping these over-the-counter pain relievers, known as nonsteroidal anti-inflammatory drugs (NSAIDs), the researchers sound a note of caution: The pills can cause bleeding in your digestive tract.

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The fact that diabetes and pre-diabetes were the only measures to increase sharply suggests the spike should be "interpreted with caution, " the researchers say.

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Researchers caution that the vaccines are still up to five years away, if they work at all.

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