On the back of the card is a short paragraph talking about that particular topic.
每张卡片的背面都有一段特别话题。
The topic of each paragraph is this article has been introduced in its first sentence.
这篇文章每一段的中心意思已经在各段的第一句话里介绍了。
The paragraph should contain only one central idea. this can be stated in a topic sentence.
一个段落只能表达一个中心思想，往往在主题句中提及。
Notice the topic sentence is usually the first or the last sentence of a paragraph.
注意主题句经常是一个自然段的第一句或最后一句。
Notice the topic sentence is usually the first or the last sentence of a paragraph.
注意主题句经常是一个自然段的第一句或最后一句。
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