政治不是理论，而是实践。
Politics is not theory, but practice.
Hard work, under the old system, meant long hours, little rest, and poor pay. Under the new system, it means a fair day's work for a fair day's pay.
"The more you give, the more you get back."
In mathematics, you don't understand things. You just get used to them.
The characters I paint are not children, they have a rebellious spirit.
我们必须投资于不仅能提高效率而且能减少环境影响的技术。