说明文是以说明为主要表达方式来解说事物、阐明道理而给人以知识的文章。它要求语言准确简明、通俗浅显、条理清晰而有逻辑性。这种文体多采用一般现在时。
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__话题__ is a most effective way to __点明要说明事物的必要性__．
For most people, it is almost impossible to __介绍某事物对多数人的重要意义__. __话题__ is really __该事物的优势或显著特点__. With the functions of __话题__， it enables us to __该事物的作用__. It can even __进一步说明该事物的作用__. Just imagine, all this can be done with __说明事物的重要性__．
A convenient tool can certainly work well, but it does not always help __承上启下，介绍事物的另一方面__. Too much __该事物的负面影响一__. Too many __该事物的负面影响二__. Relying too much on __话题__ makes __总结说明过分使用给我们带来的负面影响__．
