名词
中文翻译：Unknown
同义词：
['subject matter', 'subject matter copy', 'subject matter copying', 'subject matter copying']
例句：
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1. The teacher asked us to take a subject copy of the textbook for review.
老师让我们带一本课本的副本来复习。
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2. The company is looking for a subject matter copy to help them improve their product line.
公司正在寻找一个主题副本，以帮助他们改进产品线。
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3. The writer has written several subject matter copies for different clients.
这位作家为不同的客户提供了几次主题副本。