clayey [sandy] soil; 粘[砂]壤
fertile [rich] soil 沃壤
be as far removed as heaven from earth; be vastly different; 天壤之别
There is a world of difference. 有霄壤之别。
have a common border; be adjacent to each other; 接壤
a remote, backward place 穷乡僻壤
Rang Qiu 壤丘
牛津高阶第八版
美国韦氏词典
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维基百科 (自由的百科全书)