The study authors note that certain race-related factors could have affected the results, though it's not clear how.
研究作者提到，一些跟种族有关的因素也会影响调查结果，即便目前为止还尚未明确。
The study did not look at how alcohol may provide health benefits, but Streppel said it could be due to an increase in high-density lipoprotein (HDL) cholesterol, or to a reduction in blood clotting.
该研究没有考察酒精是如何发挥其益于健康的作用的，但Streppel称，这可能归功于增加高密度脂蛋白（HDL）胆固醇或缩小血液凝块。
In fact the language learning is just a bottleneck, just your skill not to get home, is it add skillful to study to study diligently, how could so unfairly it will be God, let you can?
其实语言学习不过是瓶颈罢了，只是你功夫没到家而已，勤学加巧学，老天怎么会这么不公平，让你不会呢？
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