英语词汇“gravel and cobble stratum”的翻译、意思、用法、释义-英汉汉英双解词典

词汇	gravel and cobble stratum
释义	gravel and cobble stratum 基本例句卵砾石地层 Gravel strata is a kind of typical instable layer in drilling engineering.卵砾石地层是钻探工程中常见的一种典型的不稳定地层。
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