刘黄沟流域内具有丰富的土砂石块和陕峻的地形，又遇有暴雨，是发生泥石流的原因。

The plenty of loose solid materials, precipitous slopes, and the freguenf rain storms, are the main reasons for the formation of the debris flow in the valley.

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团队的成员年龄不一，下至六岁的陆可怡（音），上至她七十岁的祖父刘功生（音），他是一位退休的矿业工程师； 他的老伴儿黄雪晴坐在轮椅上。

We ranged in age from six-year-old Lü Keyi to his seventy-year-old grandfather, Liu Gongsheng, a retired mining engineer, who was escorting his wife, Huang Xueqing, in her wheelchair.

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刘宇和同学们很快为黄西的校园演讲设计了一张醒目的海报。

So Liu and his schoolmates quickly designed an eye-catching poster for Huang's campus talk.

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