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，王蛇會吃其他種類的蛇——在攻擊、殺死、消化響尾蛇時，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.
如果你覺得有需要尋求專業(yè)的幫助，不要猶豫，及時的打電話或探訪當?shù)氐腉P，專家顧問及精神病治療醫(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,這個式子只在,兩遍都是無窮小的情況下成立
耶魯公開課 - 基礎物理課程節(jié)選

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