At this time, it is important to remember a quick lesson in chemistry.
在这个时候，快速地记住在化学中的一些教训就很重要了。
This was my first lesson in chemistry and I never forgot it.
这就是我第一节化学课，并且我从没有忘记它。
In our country's secondary medicine education, chemistry is an important basic lesson.
化学在我国中等医学教育中是一门重要的文化基础课。
In our country's secondary medicine education, chemistry is an important basic lesson.
化学在我国中等医学教育中是一门重要的文化基础课。
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