英语听力精选进阶版 11619
时间：2019-04-29 07:03:44
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（单词翻译）
31 Jul 2014: Slate1 Mines, Snowdonia
Thu, 31 Jul 14
Snowdonia's slate once roofed the world. But that was in Victorian times. Helen Mark finds out what's become of the abandoned slate quarries2 and caverns3 today.
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