mudslide 泥石流
mudslide-stricken region 泥石流受灾地区
geological disasters 地质灾害
secondary disaster 次生灾害
barrier lake 堰塞湖
upper reaches 上游河段
the water level of the lake 湖水水位
范文一：
one joozone's possible version：
on aug 7, 2010,a powerful mudslides damaged houses in the landslide-hit zhouqu county, gannan tibetan autonomous prefecture in northwest china's gansu province.
2010年8月7日，甘肃甘南藏族自治州舟曲县发生特大泥石流。
i fell very distressed that when i saw the pictures about mudslide-stricken region.the whole villages were wiped out by the terrible mudslide. hundreds of people lost their lives or were rendered homeless.
当我看到泥石流受灾地区的那些图片的时候，心里非常难过。整个村子都被泥石流夷为了平地(泥石流使整个城镇破坏相当严重)。成百上千的人失去了生命和自己的家园。
soldiers carry out rescue efforts in mudslide-hit zhouqu county, northwest china's g