研究人员提醒说，这项研究仅限于欧洲血统的人。
The researchers caution that the study was limited to people of European descent.
研究人员提醒道，并非所有的工资差异都由睡眠直接导致。
Not all of these wage differences are due directly to sleep, the researchers caution.
研究人员提醒说，这些工资差异并不全是由睡眠直接引起的。
Not tall of these wage differences are due directly to sleep, the researchers caution.
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