过去是一个陌生的国度;他们在那里做事的方式不同。
"The past is a foreign country; they do things differently there."
我们今天种下的每一粒种子都是对后代的承诺。
Do not think it worthwhile to produce belief by concealing evidence, for the evidence is sure to come to light.
The essence of mathematics lies in its freedom.