do not hesitate

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。
If you sense the need for professional advice, do not hesitate to call or visit your local GP, professional counsellor or psychotherapist.
如果你觉得有需要寻求专业的帮助，不要犹豫，及时的打电话或探访当地的GP，专家顾问及精神病治疗医师。

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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