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来源:雅诚德英语网
When I was researching this for a study a few years ago, I visited a couple of these typical limestone caves, and they were all very wet, you know, from streams and rivers.
几年前我做这项研究时,我探访了其中几个比较典型的洞穴,它们都很潮湿,你们也知道这是因为小溪和河流的缘故。