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    现在，很多学校建造了塑胶操场和跑道，但有报道说塑胶表面会在强烈光照下散发出有害气体。你班同学对此进行了讨论。请用英语写一篇短文，介绍讨论结果，须包括下列要点：

    1．  塑胶表面散发的有害气体十分有限，在户外不足以影响人们的健康。

    2．  与传统的水泥场地相比，塑胶场地大大减少了运动损伤。

    3．  如果用草地取代塑胶，所带来的高昂费用难以承受。

    4．  散发过多有害气体是因为有些塑胶跑道使用了劣质材料。

    注意：1．可适当增加细节，使行文连贯；

    2．词数：120字左右；

    3．参考词汇：塑胶操场和跑道rubberized playgrounds and running tracks

    水泥场地cement ground

                                                                

    One possible version:

    Now a great number of rubberized playgrounds and running tracks have been built in schools. However, it is reported that the rubberized surface gives off a poisonous gas in strong sunlight. So we had a discussion about it in our class.

    Most of my classmates think it’s not necessary to be overreacting to that because the amount of poisonous gas is too small to harm the people playing outdoors. Compared with traditional cement grounds, rubberized ones have greatly reduced sports injuries. Besides, if rubber is replaced with grass, most schools cannot afford the high cost.

    The reason why some rubberized playgrounds give off too much poisonous gas is that the materials of poor quality have been used. Therefore, schools should be careful to choose the building materials.

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