种一棵树最好的时间是20年前,其次是现在。
The best time to plant a tree was 20 years ago. The second best time is now.
If a man is proud of his wealth,he should not be praised until it is known how he employs it.
Sustainable development is not a choice, but a responsibility.
我本人是个乐观主义者,因为做别的貌似没什么用。
Quality should never be compromised for short-term gains.