A massive rockfall trapped the men as they operated a tunnelling machine.
那些男人在驾驶隧道掘进机时，一次大面积的岩崩困住了他们。
《柯林斯英汉双解大词典》
2
This paper puts forward a main working procedure and technique demand about building monitoring net (station) of rockfall and landslide.
本文提出了对崩滑地质灾害监测网(站)建网方案进行优选设计的主要工作程序和技术要求。
3
In this paper, the treatment practice of rockfall hazardous mass by reduce-loading, anchor generalization method in Mou-Bau highway section is reported.