The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.

你送给我桃子，我就回报给你李子。意思是做人要知恩图报，不能忘恩负义。也比喻礼尚往来，相互赠送礼物。

可持续性不是成本；而是对我们共同未来的投资。

"A nation that destroys its soils destroys itself. Forests are the lungs of our land, purifying the air and giving fresh strength to our people."

一个人笑的时间是与众神共度的时间。