最大的智慧是认识到自己的无知。
The greatest wisdom is to recognize one's own ignorance.
Only by integrating environmental protection into the entire production process can green development be truly achieved.
The world is a book, and those who do not travel read only one page.
安全是我们所有作业中的首要任务。
Don’t create things to make money； make money so you can create things. The reward for good work is more work.
——杜抨击当时的国民政府。