The only limit is the one you set yourself.
Overfishing will only deplete marine resources, we must take the path of green fisheries.
The most profound discoveries in mathematics often come from questioning the most basic assumptions.
数学中最深刻的发现往往来自于对最基本假设的质疑。
"In every word, there is a world waiting to be discovered."
The world is full of obvious things which nobody by any chance ever observes.
