如果你不偶尔失败,说明你不够努力。
农民的智慧常常超越最新技术——我们必须学会倾听。
科学的进步不是一条直线,而是一个螺旋,总是在前进,又总是回到起点。
The only relationship that can make both partners happy is one in which sentimentality has no place and neither partner makes any claim on the life and freedom of the other.