rubbish 垃圾; 废物; 碎屑; 碎屑，垃圾; 不可数.
litter [ 'litə ] n. 垃圾；应该也是不可数.
Don't throw litters.
请不要乱扔垃圾。
见过这句,但太少了. 通常不加.
garbage这个是可数的.
Garbages should be dumped into garbage can.
垃圾应倒进垃圾桶内。
One day he found his courtyard full of garbages.
有一天，他发现自己家院子里堆满了垃圾。
Urban domestic garbages are big problems in the process of urbanization.
城市生活垃圾是我国城市化过程中的一大难题。
