If you're unsure about that, check out, of course, chapter three in the textbook, where these issues are addressed.

当然,如果还不确定,可以看看课本的第三章,这些问题都提到了

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open your textbook and put a circle around question number one.

打开你的课本，在第一个问题上画一个圈。

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And, if you have trouble balancing equations, you can look in section 2.11 in the text.

如果你在配平方程式方面有问题，你可以看看课本中的2。11节。

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