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。
Mr Aldersey-Williams bemoans the decline of classroom chemistry, and the rise of a culture in which experiments performed by teachers must be timed to coincide with the length of the lesson.
奥尔德-威廉姆斯[color=#0000ff]抱怨化学教学的倾斜以及一种文化的[color=#0000ff]兴起。 在这种文化中教师[color=#0000ff]做实验[color=#0000ff]的时间必须配合一节课的长度。
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。
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