Let's say that you are a true skeptic and you don't believe in differentials yet then it is maybe not very good that I actually used more of these differential notations in deriving the answer.

应该会有疑问的，而且还是不太相信微分，那么我的证明过程中，多次用到的微分符号，就有问题了。

youdao

Here are 3 good exercises that can help you create a strong, clear focus and of course these are answer to your question how to improve concentration.

下面的3个训练可以帮你拥有一个强有力的，清晰的注意力。当然，这也是如何改善注意力的方法。

youdao

That's a very good question, and unfortunately, there is not a single answer. There are a number of different scenarios that you may have to deal with depending upon your situation, for example

这是一个非常好的问题，遗憾地是，没有一个标准的答案。

youdao

Not a good idea to discover the answer at 7:04 if you are planning to make the 7:05.

FORBES: Stuff I Learned On My First Day At