英语词汇roof periodic caving怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	roof periodic caving
释义	roof periodic caving 简明释义顶板周期垮落网络释义 1 [矿业]?顶板周期垮落顶板周期垮落短语 1 roof periodic caving law 顶板周期垮落规律双语例句 1 Based on field observations and theoretical analyses, the characteristic of periodic caving of immediate roof and main roof in a room and pillar system was analyzed. 通过理论分析和现场实测，对房柱式采煤的矿压显现规律及其特点进行了探讨。
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英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。