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。
Anything a sentence talks about is the topic.
句子讨论的东西就是主题。
Anything a sentence talks about is the topic.
句子讨论的东西就是主题。
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