do not hesitate to

基本解释

Look at hybrid methods and do not hesitate to mix different techniques.
看一看混合的方法，在混合不同的技术面前不要犹豫。
As their name indicates, kingsnakes eat other snakes — they do not hesitate to attack, kill and consume rattlesnakes.
蛇如其名，王蛇会吃其他种类的蛇——在攻击、杀死、消化响尾蛇时，他们从不犹豫。
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.
如果有约会邀请时你已不再迟疑，可以喝他们一起做些事情，和他们在一起时每时每刻都和开心，那么我想你已经知道答案了。

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.
关键在于,只要你推出的式子分母上有dt,不要犹豫,直接约掉,这个式子只在,两遍都是无穷小的情况下成立
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