Persistence is key in mathematical research; many great results come from long struggles.

成功是日复一日微小努力的总和。

The state is not a work of art; it is a necessity.

The artist must be a child of the earth.

我不是理论家。我不是知识分子。我靠直觉行事。

I'm not a creature of your government's creation.

Never stop learning, because the world never stops changing.

风险管理是战略管理的重要组成部分。

对于系统，翻版的模拟是在控制图中添加一个创建循环的边，而不仅仅是一个附加节点。