送交者: coubert 于 2009-11-13, 12:16:40:

回答: UFO! 由 gyro 于 2009-11-13, 12:10:43:

• Plane of the same shape flies easier at low altitude - gyro (162 bytes) 2009-11-13, 12:29:46 (385563)
  • "I don't know how the forward propelling force is generated". hahaha (无内容) - tinaliang (0 bytes) 2009-11-13, 12:32:36 (385566)
    • 为什么笑呀， (无内容) - coubert (0 bytes) 2009-11-13, 12:36:26 (385569)
      • 好笑啊. 你俩文科的? (无内容) - tinaliang (0 bytes) 2009-11-13, 12:40:05 (385575)
        • My major is natural philosophy - gyro (52 bytes) 2009-11-13, 12:41:18 (385576)
          • you move forward by moving media around you backward, like swimming. (无内容) - tinaliang (0 bytes) 2009-11-13, 12:47:36 (385586)

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