Mathematics is a conversation between the past and the future.

Every individual has a place to fill in the world and is important in some respect whether he chooses to be so or not.

化工行业有责任在减少环境影响方面发挥带头作用。

The challenges in our lives are there to strengthen our convictions. They are not there to run us over.

给我们赦免的，是忏悔而不是牧师。

沉默可能是共谋。