我已将这一原则——每一微小变异若有益便被保存——称为自然选择。
I have called this principle, by which each slight variation, if useful, is preserved, by the term Natural Selection.  
家不是一个地方,而是一种感觉。
I'm not going to sit here and say I'm a role model or anything, but I do think I have a responsibility.