但总很清楚
But it's always very clear
以上为机器翻译结果，长、整句建议使用 人工翻译 。
高密度胆固醇对不肥胖和总胆固醇水平高的人非常有益。但其原因仍不是很清楚。
The HDL benefits were greatest in people who weren't obese and those with high levels of total cholesterol. The reasons for those findings aren't clear.
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