Learner's definition of SHELF
[count]
1
: a flat board which is attached to a wall, frame, etc., and on which objects can be placed架子;搁板 -
Put the vase on the shelf.把花瓶放到架子上。
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the top/bottom shelf of the kitchen cabinet厨房壁橱的顶层/底层搁板
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Will you get that book down off the shelf?把那本书从架子上拿下来好吗?
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We don't have much shelf space.我们的架子上空间不多了。
— see also bookshelf 2
geology : a flat area of rock, sand, etc., especially underwater(尤指水中)陆架,底岩,沙洲 — see also continental shelf
off the shelf
: directly from a store without having to be specially made or ordered现货;现货供应
on the shelf
: in an inactive state : not active or being used被搁置的;被废弃的