do not hesitate

基本解釋

Look at hybrid methods and do not hesitate to mix different techniques.
看一看混合的方法，在混合不同的技術(shù)面前不要猶豫。
As their name indicates, kingsnakes eat other snakes — they do not hesitate to attack, kill and consume rattlesnakes.
蛇如其名，王蛇會(huì)吃其他種類的蛇——在攻擊、殺死、消化響尾蛇時(shí)，他們從不猶豫。
If you sense the need for professional advice, do not hesitate to call or visit your local GP, professional counsellor or psychotherapist.
如果你覺(jué)得有需要尋求專業(yè)的幫助，不要猶豫，及時(shí)的打電話或探訪當(dāng)?shù)氐腉P，專家顧問(wèn)及精神病治療醫(yī)師。

So, the point is whenever you have derivatives with something over dt, do not hesitate to cancel the dts This will be actually true as long as both quantities are vanishingly small.
關(guān)鍵在于,只要你推出的式子分母上有dt,不要猶豫,直接約掉,這個(gè)式子只在,兩遍都是無(wú)窮小的情況下成立
耶魯公開課 - 基礎(chǔ)物理課程節(jié)選

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