There have been four previous ground-breakings, the first in 1925 and the fourth in the mid-1970s.
而在此之前，市府已曾四次试图动工修建该线路了（第一次是在1925年，最近一次则是在20世纪70年代中期）。
Many breakings in anchor bolts and cables in tunnel of deep soft rock were one of problems faced by roadway supporting.
深部软岩巷道中大面积锚杆、锚索破断现象是巷道支护面临的一个难题。
Many breakings in anchor bolts and cables in tunnel of deep soft rock were one of problems faced by roadway supporting.
深部软岩巷道中大面积锚杆、锚索破断现象是巷道支护面临的一个难题。
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