(anatomy) a layer (a lining or membrane) that encloses a structure; "stomach walls" 同义词：wall,
例句与用法
1.
China and u . s have stronge complementarity in economic and trade field . two paries can share a big martet from eachother 两国（中美）经贸领域的互补性很强，双方可以彼此分享巨大的市场。
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