A mathematical proof is a poem written in the language of logic.
keep fit and don't lose your nerve.
盖亚假说是为那些喜欢散步或只是站着凝视的人准备的,他们思考地球及其承载的生命,并推测人类活动的后果。
对自由民主最严重的威胁来自内部,来自制度的衰败和对它们的信任的丧失。
Some of my best leading men have been dogs and horses.