Flying Robots to Clean Up Mount Everest
Mount Everest is the tallest mountain on Earth. Every year, many people climb it. But they leave a lot of trash. It makes the mountain dirty and dangerous.
聖母峰是世界最高峰，每年都有很多人去攀登，但是他們留下很多垃圾，讓聖母峰變得又髒又危險。
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