失败只是通往成功的垫脚石。
Failure is just a stepping stone to success.
I don't sing because I'm happy; I'm happy because I sing.
Free trade is the key to the prosperity of a nation.
数学的真正力量不在于它的复杂性,而在于它的简洁和优雅。
Quality should never be compromised for short-term gains.