英语词汇hard roof的读音、用法、中文释义、短语词组及例句-英汉双解词典

单词	hard roof
释义	hard roof 英?[hɑrd ru:f] 美?[hɑ?(r)d ruf] 释义坚固顶板实用场景例句全部 As the exploIt'strength increasing, rock - burst may occur under the condition of non - hard roof. 即使是非坚硬顶板条件,当开采强度加大时, 也将发生冲击地压灾害. 互联网
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hard roof