do not hesitate to

基本解释

Look at hybrid methods and do not hesitate to mix different techniques.
看一看混郃的方法，在混郃不同的技術麪前不要猶豫。
As their name indicates, kingsnakes eat other snakes — they do not hesitate to attack, kill and consume rattlesnakes.
蛇如其名，王蛇會喫其他種類的蛇——在攻擊、殺死、消化響尾蛇時，他們從不猶豫。
You will know it if you do not hesitate to go out with them, do things with them and allow yourself to enjoy every moment being with them.
如果有約會邀請時你已不再遲疑，可以喝他們一起做些事情，和他們在一起時每時每刻都和開心，那麽我想你已經知道答案了。

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.
關鍵在於,衹要你推出的式子分母上有dt,不要猶豫,直接約掉,這個式子衹在,兩遍都是無窮小的情況下成立
耶魯公開課 - 基礎物理課程節選

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