20公里后她因胃痛而退出了比赛。She dropped out after 20 kilometres with stomach trouble.通过胃部肌肉的收缩食物和流质在胃中混合。Foods and fluids are mixed in the stomach by its muscular contractions.她仍然患有严重的胃痉挛，感觉疼痛、疲乏、抑郁。She continued to have severe stom...
Is the most famous astronomer Ptolemy.最为著名的天文学家是托勒密.Ptolemy charted more than 1000 stars in 48 constella-tions.托勒密绘制了48个星座1,000多颗恒星的星位图。Ptolemy's model of the universe with the Earth at the center.托勒枚的以地球为中心的宇宙模型.Pt...