shelf是可数名词。其复数形式是shelves。
shelfn.(固定在墙上的或橱柜、书架等的)架子，搁板.
There were shelves full of dusty books.
有些书架上全是布满灰尘的书。
They were busy stacking the shelves with goods.
他们正忙着摆货物上架呢。
The books had been piled on the shelves in a haphazard fashion.
书架上的书堆放得杂乱无序。
水利万物而不争,
而万物莫能与之争。
