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有这么一段话： It seems unlikely that we'll see UFO's invade the earth, a time machine, or robots that look exactly the same as humans - at least in our lifetime - but as the drawings of Da Vinci prove, given enough time, and the right technology, even the most fantastic of ideas can come true. 其它都没问题，就是不明白 “UFO's invade the earth” 中那个 ‘s 在这是做什么用的？ 谢谢先！ |
