I think at the beginning of each book a brief introduction to it is necessary.
我认为每本书开头的简短介绍都是很有必要的。
In the beginning, the teacher gave us a brief introduction about the subject.
开始时，老师给我们做了关于这门课程的简短介绍。
In the beginning, the teacher gave us a brief introduction.
开始时，老师给我们做了简短的介绍。
Because of this tendency, in the beginning let your check-ins be brief.
基于这种趋势，在起初时让你的检查程序简单一些。
Because of this tendency, in the beginning let your check-ins be brief.
基于这种趋势，在起初时让你的检查程序简单一些。
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