active line number
活动线路号
以上为机器翻译结果，长、整句建议使用 人工翻译 。
There are a number of active faults that line the Midlands Microcraton, and many of the tremors experienced on the western side of the English Midlands, up to the Pennines, are a result of rocks jostling in this area.
BBC: Q&A: UK's small-scale earthquakes
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