求教!

xhm_orlando · 发表于 2010-10-7 09:59:08

Doctors generally agree that such factors as cigarette smoking, eating rich foods high in fats, and alcohol consumption not only do damage by themselves but also aggravate genetic predispositions toward certain diseases.
请教各位NN ，为什么又个 by themselves? 如何理解，另外这句话怎么翻译呢？谢谢~！

shanjun0888 · 发表于 2010-10-7 10:21:59

意思就是这些行为本身就是有害的，同时它们还会诱发其他疾病。。。。我猜的。。。。

xhm_orlando · 发表于 2010-10-7 10:31:32

我也是这样想的，但总感觉别扭~

求教!

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