有些鸟儿是关不住的，因为它们的羽翼太耀眼。
Some birds are not close, because they are too bright.
Success is not the key to happiness. Happiness is the key to success.
keep fit and don't lose your nerve.
The Dead Poets were dedicated to sucking the marrow out of life.
Persistence is key in mathematical research; many great results come from looking at the same problem from different angles over and over again.
Certification is the grammar of responsible forestry.
"The emotions are like a computer's output devices - they motivate action to solve specific adaptive problems."
数学的本质不是使简单的事物复杂化，而是使复杂的事物简单化。
Don't let anyone tell you that you can't do something