迅速融化的积雪形成泥石流横扫高山和峡谷，淹没城镇。
Mud flows from rapidly melting snow can strip mountains and valleys bare and bury towns.
舟曲县县城位于峡谷之中。暴雨随陡峭贫瘠的山坡迅速流下，引发了泥石流，水位也便猛涨。
Zhouqu town is in a valley. Heavy rain quickly ran off the steep, barren hills, triggering mudslides and swelling the river.
地铁女发言人丹尼斯·提勒尔称，从文图拉县到洛杉矶的早班地铁在经过狭窄多石的峡谷时遇上了泥石流。
Metrolink train on a morning commute from Ventura County to Los Angeles through a narrow, rocky gorge hit a slide of mud and rocks on the tracks.
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