这些窗帘是纯蓝色的。
Kenney says the rubber is very solid - probably harder than a running track.
人行道上所用的橡胶其实十分坚固。甚至可能比田径场上的跑道还要硬一些。
Plastic and rubber are the main ingredients of Municipal solid waste (MSW).
塑料和橡胶类的废弃物是城市垃圾的重要组成。
Plastic and rubber are the main ingredients of Municipal solid waste (MSW).
塑料和橡胶类的废弃物是城市垃圾的重要组成。
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