公式： f(x)=x⋅σ(x)
Alison Francis,Senior Science Journalist
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Mosquitos began biting humans more than a million years ago | An analysis of 38 modern mosquitoes’ DNA suggests an ancestral mosquito species developed a preference for feeding on early humans between 2.9 and 1.6 million years ago,
· 马琳 · 来源：huadong资讯