Coal tunnel bolting has the feature of hiding. Surrounding rock damage hasn’t obvious omen.
煤巷锚杆支护由于其隐蔽性,围岩的破坏失稳没有明显的预兆,一旦发生冒顶,危害性较大。
参考来源 - 电磁辐射在煤巷锚杆支护监测中的应用·2,447,543篇论文数据，部分数据来源于NoteExpress
N-COUNT If you say that something is an omen, you think it indicates what is likely to happen in the future and whether it will be good or bad. 预兆
Her appearance at this moment is an omen of disaster.
她此时的出现是灾难的预兆。
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