单词：involutional depressions
(involutional depression 的复数)
单词：involutional depressions 相关文章
John Bell, director of Desert Surveys in Egypt, asked these questions in 1927. Can other depressions in this region, besides the much-discussed Wadi Rayan, be considered possible of utilization in connection with irrigation or drainage of the Nile De
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托福阅读长难句：平原和洼地 Flats and depressions where water cancollect are common features, but they make up only a small part of thelandscape. 记忆单词： depression n.洼地;沮丧 landscape n.地貌 理解句子： where引导的定
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