免疫系统就像一把双刃剑；它可以对抗癌症，但也需要被控制。
"The immune system is like a double-edged sword; it can fight cancer but also needs to be controlled."
Life is a song, sing it your way.
Freedom of speech is the great bulwark of liberty; they prosper and die together.
追求完美是优秀的敌人。