英语词汇rock layer forming roof of a cave or mine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	rock layer forming roof of a cave or mine
释义	rock layer forming roof of a cave or mine— 顶板
随便看	duty to examine duty to exercise care duty to explain duty to incorporate duty to indemnify duty to inform duty to inquire duty to inspect duty to interfere duty to keep confidential duty to maintain duty to maintain confidentiality duty to maintain secrecy duty to mitigate duty to monitor duty to notify duty to obey duty to obtain permit duty to pay taxes duty to preserve duty to prevent duty to protect duty to prove duty to record duty to rectify

英汉双解词典包含2273206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。

rock layer forming roof of a cave or mine—