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重点讲解：
1. a pile of/piles of
一堆；一叠；大量；
eg. We sat in Sam's study, among the piles of books.
我们坐在萨姆的书房里，身边是一堆一堆的书。
eg. I cannot cope with such a pile of work.
我无法处理这么多工作。
2. be strewn with
布满的；撒满的；
eg. The front room was strewn with books and clothes.
起居室里到处都是书和衣服。
eg. The riverbed was strewn with big boulders.
河床上散布着很多大圆石。
3. knock over
撞倒；翻倒；
eg. A car knocked him over.
一辆车把他撞倒在地。
eg. The cat couldn't possibly knock over the trash can.
猫不会把垃圾桶拱翻。
n. 混乱，无秩序，混沌
