New words：

litter [ˈlɪtər]
v.乱扔；使乱七八糟；使凌乱；使遍布
n.垃圾；废弃物；乱七八糟的东西；乱放的杂物

Sample Sentences：

The streets were full of litter.
There were piles of litter in the streets.

The streets were littered with rubbish.
He littered the yard with bottles and cans.

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