"Ultraviolet radiation can neither be seen nor felt," the study noted.
“紫外辐射式看不到的也感觉不到的”，这项研究指出。
The study noted four strategies that were associated with weight maintenance but not loss.
研究列出了能够有效保持体重，而非减轻体重的四个方法。
There are two important limitations to the study, the researchers noted.
研究人员指出，这个研究有两个重要的限制。
There are two important limitations to the study, the researchers noted.
研究人员指出，这个研究有两个重要的限制。
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