One often calms one's grief by recounting it.
You have to believe in yourself when no one else does.
糟糕的戰(zhàn)略不是缺乏戰(zhàn)略，而是主動回避制定好戰(zhàn)略的艱苦工作。
系統(tǒng)的穩(wěn)定性取決于開環(huán)傳遞函數(shù)在復(fù)平面上的行為。