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。
The central theme is usually summarized in what is called the topic sentence.
中心议题通常被概括地称为主题句。
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。
Sentence initial topic construction is also driven by feature-checking.
句前动宾话题结构也是受特征核查驱动的移位而生成。
Do all the other sentences support the topic sentence?
其他的句子是否能够说明或支持主题句？
每段的主题句是什么？
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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