结合实际从衣、食、住、行、学习等说明如何低碳生活。
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The topic-comment distinction depends on the point of view of the listener.
What is one obvious presupposition of a speaker who says; Where did he buy the beer? Your watch is broken. We regret buying that car.
All languages have some differences in verb forms which are used to produce cohesion.(南开大学2005研)