The knowledge of the circumstances of which we must make use never exists in concentrated or integrated form, but solely as the dispersed bits of incomplete and frequently contradictory knowledge which all the separate individuals possess.

可持续发展不是选择题，而是责任。

As in geometry the most natural way of beginning is from a mathematical point, so is the same method in observations and natural history the most genuine, simple, and instructive.

我不害怕失败，我害怕不去尝试。

公共领域是一个交流信息和观点的网络。