塑料或橡胶制成的运动场跑道rubberized artificial running track
这里的塑胶跑道是今年上半年新铺设的。
The rubberized artificial running track here was laid in the first half of this year.
这些学校必须有400米塑胶跑道。
These schools must have 400 m rubberized artificial running tracks.
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