云朵飘飘，萦绕着我的车轮；疾风飒飒，吹掠着我的车旗。缤纷连绵，昏昏暗暗又朦胧，倏忽之间，惚惚回到了故乡。
I have called this principle, by which each slight variation, if useful, is preserved, by the term Natural Selection.
The only limit to our realization of tomorrow is our doubts of today.
对民主的爱就是对平等的爱。
"Parental investment is the key to understanding the origins of sex differences."