可能是公鸡在啼叫,但下蛋的是母鸡。
It may be the cock that crows, but it is the hen that lays the eggs.
Sustainability isn't a choice; it's our responsibility to future generations.
Time is a slippery thing: lose hold of it once, and its string might sail out of your hands forever.
The most sustainable building is the one that is already built.