塑胶表面，易于清理。
科学家发现，很多中学或大学操场的塑胶表面会在强烈光照下散发出有毒气体。
Scientists believe the rubberized surface found in many school and college playgrounds gives off a poisonous gas in strong sunlight.
他们称，本来的跑道也是有弯道的，但由于使用过多，塑胶表面已被严重磨损。
They claimed their original track had once featured curves but said its rubber surface had become severely worn down from overuse.
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