N (in Old English, Old Norse, etc) the change of a vowel into a diphthong (古英语，古挪威语等的)元音割裂 [linguistics]
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。
词组短语
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