The force of gravity makes things fall to earth.
地心引力使物体落向地面。
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讲(视频版) 2017年11月合集
避免气候灾难
讲 The world's first space tourist Dennis Tito had his dream fulfilled when the Russian Soyuz-TM spaceship carrying him and two Russian cosmonauts safely returned to earth after an eight-day visit to the International Space Station.
当联盟-TM宇宙飞船承载着蒂托和两名俄罗斯宇航员在国际太空站为期8天的旅程后安全着陆时,世界第一位太空游客丹尼斯? 蒂托
现了他的梦想。