下雨则可以让它保持干净：水流渗过橡胶颗粒并注入表层之下的排水管道中。
Rainfall helps keep it clean: water seeps through the rubber and drains into pipes just below the surface.
比较之下，橡胶履带通常能够使用超过3000公里。
Rubber tracks, by contrast, usually last more than 3, 000km.
比较之下，橡胶履带通常能够使用超过3000公里。
Rubber tracks, by contrast, usually last more than 3, 000km.
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