shale [ʃeɪl]

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n.页岩，泥板岩

a type of soft grey rock , usually formed from clay that has become hard, which breaks easily into thin layers

We can extract oil from shale. 我们可以从页岩中提取石油。
Most of the rock in this mountain is shale. 这座山上大部分的岩石都是页岩。