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。
It was a ill-omened place. Death walked there in the sunlight.
那是个倒霉的地方，死亡在光天化日之下游荡。
"Said she, while her ill-omened physiognomy seemed to cast a shadow over the cheerful newness of the house."
她说，她那不祥的外貌象是给这座住宅的欣欣向荣的气氛投上了一层阴影。
There was no law, not even an unwritten law, against frequenting the Chestnut Tree Cafe, yet the place was somehow Ill. omened.
没什么法律不准常去栗树咖啡馆，连不成文的法律也没有，然而那地方却颇有点凶险。
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