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。
In this sentence, the vowel sound become reduced to a central vowel.
此句中这个元音弱化为中元音。
In this sentence, the vowel sound become reduced to a central vowel.
此句中这个元音弱化为中元音。
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