本段的第一句是段落主题句，指出在城市里有许多旧楼还在发挥着作用。
Many old buildings in cities are still being found useful. In several cities, old buildings that were no longer being used have been converted to a variety of useful structures.
在英语阅读和写作教学中，正确理解段落主题句，准确把握段落主题句的种类、位置，并掌握其扩展方法，对于提高大学生的英语阅读速度和写作能力大有裨益。
A better understanding of the varieties, positions and ways of development of an English topic sentence in a paragraph is beneficial to learners in improving their reading as well as writing skills.
最重要的是，你要特别注意段落的主题句。
Most important of all, you should pay special attention to the topic sentence of a passage.
聚统计，大约有80%的主题句是段落的首句，其他20%左右的是尾句。
Gather statistics, about 80 percent of the topic sentence is the first paragraph, about 20% of the other end.
主题句简洁明了的告诉了阅卷考官这段主要说些什么，所以段落的其余语句必须密切围绕主题句进行发散思维。
The topic sentence for each paragraph tells the reader what the paragraph will be about. The ideas stated in the rest of the paragraph should all relate to the topic sentence.
主题句简洁明了的告诉了阅卷考官这段主要说些什么，所以段落的其余语句必须密切围绕主题句进行发散思维。
The topic sentence for each paragraph tells the reader what the paragraph will be about. The ideas stated in the rest of the paragraph should all relate to the topic sentence.
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