Let's go back to one row again because it's easy to work with.

我们回到一行的情况因为它更简单

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It must not be easy to write your own work.

你自己创作一定很难。

写作课程比较难 - SpeakingMax英语口语达人

And because there is an explicit relationship between u, delta u, q and w, you can always find the easy way to derive the change in internal energy or the heat or the work.

因为Δu，q和w之间,有明确的关系，一般来说,内能或热或功的变化,易于计算。

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