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Africa's Sahara is the largest desert of all.
非洲的撒哈拉沙漠是世界上最大的沙漠
It's the size of the United States, and the biggest source of sand and dust in the entire world.
它的面積相當于美國，也是全世界最大的沙塵源
Sandstorms like these appear without warning
如此巨大的沙暴出現時毫無征兆
and reduce visibility for days over areas the size of Britain.
所到之處能見度驟降為零，幾天內橫掃的地區比英國還大
Dromedaries, single-humped camels, take these storms in their stride.
單峰駝--只有一個肉峰的駱駝，頂著沙暴大步行走。
The heavy sand rises only a few metres above the ground.
最重的沙子只能離開地面幾米
But the dust can be blown 5,000 metres up into the sky.
但是塵埃卻能被吹上5000多米高的天空
The ferocious wind, armed with grains of sand, is the agent that shapes all deserts.
夾雜著沙粒的強風，塑造了各種沙漠地形。
Reptiles have armoured, scaly skins that protect them from the stinging grains.
爬行動物的皮膚覆蓋著鱗甲，能抵御刺痛的沙粒。
For insects, the bombardment can be very severe indeed.
而昆蟲則得遭受猛烈“炮火”的轟擊
The only escape is below the surface.
唯一的藏身之處當然是在沙子下面
