英汉词典

1. （上窄下宽的）堆
    A pile of things is a mass of them that is high in the middle and has sloping sides.

pile的反义词

    e.g. ...a pile of sand...
           一堆沙子
    e.g. ...a little pile of crumbs...
           一小堆面包屑

2. （一个压着一个摆放整齐的）叠，摞
    A pile of things is a quantity of things that have been put neatly somewhere so that each thing is on top of the one below.

pile的近义词

    e.g. ...a pile of boxes...
           一叠盒子
    e.g. 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。