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英语翻译Sinkholes happen when the weather is dry .The earth at t

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英语翻译
Sinkholes happen when the weather is dry .The earth at the surface begins to drop into empty space under the ground ,like sand falling in huge hourglass.this is how sinkhold is formed .
污水坑是当气候干燥时形成.地表层的泥土陷入下面空洞层中,就象沙子滴入沙漏.这就是污水坑的形成过程.