如果电能来源于煤，那它们仍然比传统汽车有优势——但是如果该电能来源于风能、太阳能甚至是(最好别是)核能，那优势就没有多少了。
If it comes from coal, they are still better in global-warming terms than traditional cars-but not by as much as they could be if the power were wind, solar or even (whisper it not) nuclear.
首先，之前在幼儿园研究中发现的，非独生子女社交能力比独生子女有优势，但这些优势也十分有限。
First, the social advantages found in children with siblings in the kindergarten study were quite modest.
如果电能来源于煤，那它们仍然比传统汽车有优势——但是如果该电能来源于风能、太阳能甚至是(最好别是)核能，那优势就没有多少了。
If it comes from coal they are still better in global-warming terms than traditional cars-but not by as much as they could be if the power were wind solar or even (whisper it not) nuclear.
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