Mexico’s southern border stretches for 960km (600 miles), snaking through remote highlands and thick jungle. Patrolling it is hard.
墨西哥南方边界全长960公里，在遥远的高地和茂密的丛林里蜿蜒前进，巡逻任务非常艰难。
Mexico's southern border stretches for 960km (600 miles), snaking through remote highlands and thick jungle. Patrolling it is hard.
墨西哥南方边界全长960公里，在遥远的高地和茂密的丛林里蜿蜒前进，巡逻任务非常艰难。
However, Venus is all the time enveloped in thick clouds and mists, as if they are a layer of very thick veil, which renders it very hard for human beings to have a peep at its true features.
但金星始终为浓云密雾所笼罩，仿佛一层厚厚的面纱，使人类难以窥视到它的真面目。
Part of ore body in Jinchangyu Gold mine is this kind of gently inclined thin and medium thick ore body with unstable roof, it is hard to mine.
金厂峪金矿部分顶板不稳定的缓倾斜薄至中厚矿体，其开采难度很大。
Part of ore body in Jinchangyu Gold mine is this kind of gently inclined thin and medium thick ore body with unstable roof, it is hard to mine.
金厂峪金矿部分顶板不稳定的缓倾斜薄至中厚矿体，其开采难度很大。
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