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- The orbits of planets in the once popular geocentric Ptolemaic system are epitrochoids. 曾经盛行的托勒密地心说体系里的行星轨道就是外旋轮线。
- Text at the upper right explains the movement of the planets according to the Ptolemaic system. 右上角的文字解释了托勒密系统的行星运动。
- Polish astronomer who advanced the theory that the earth and other planets revolve around the sun,disrupting the Ptolemaic system of astronomy. 哥白尼,尼科劳斯1473-1543波兰天文学家,他提出地球及其它行星绕太阳运动的日心说,推翻了托勒密的天文学理论即地心体系
- In the Ptolemaic system of planetary motion the earth is fixed as the center of the universe with the sun and moon and planets revolving around it. 在托勒密的行星运动体系里，地球是固定的，是宇宙的中心，太阳、月亮和其他行星都绕着地球转。
- The top panels clearly illustrate the necessary geometry for a lunar (left) and solar eclipse in the Earth-centered Ptolemaic system. 图的最上面清楚地表明了托勒密体系：以地球为中心的月球（左）和太阳轨道的椭圆几何。
- Polish astronomer who advanced the theory that the earth and other planets revolve around the sun, disrupting the Ptolemaic system of astronomy. 哥白尼，尼科劳斯1473－1543波兰天文学家，他提出地球及其它行星绕太阳运动的日心说，推翻了托勒密的天文学理论即地心体系
- Copernicus,Polish astronomer who advanced the theory that the earth and other planets revolve around the sun,disrupting the Ptolemaic system of astronomy. 哥白尼，波兰天文学家，他提出地球及其它行星绕太阳运动的日心说，推翻了托勒密的天文学理论即地心体系。
- Nicolaus Copernicus, a Polish astronomer, advanced the theory that the earth and other planets revolve around the sun, disrupting the Ptolemaic system of astronomy. 本句讲述了通过实验得到的普遍真理。“过去式”引导的宾语从句中：普遍真理一定要用“现在式”。
- "the Ptolemaic system with its built-in concept of periodicity"; 注释列句：existing as an essential constituent or characteristic;
- or or relating to the geocentric Ptolemaic system. 指托勒密的地心说体系或者与此体系相关的。
- the Ptolemaic system with its built-in concept of periodicity; a constitutional inability to tell the truth. 托勒密之天动学说及其内部的周期定律；生来爱撒谎的毛病。
- I suppose you also have a caste system in your society. 我想你们的社会里也有一种等级制度。
- The right to dissent is part of our political system. 有持异议的权利是我们政治体制的组成部分。
- Do you know how to log in to the system? 你知道怎么登录进入这个系统吗？
- Public opinion was against the old feudal system. 公众舆论反对旧的封建制度。
- The system works on the principle that heat rises. 该项装置是按照热力上升的原理运转的。
- the Ptolemaic system with its built-in concept of periodicity; a constitutional inability to tell the truth 托勒密之天动学说及其内部的周期定律；生来爱撒谎的毛病
- The drainage system has been aged. 排水系统已经老化了。
- They called for a radical reform of our tax system. 他们要求对税收制度进行根本改革。
- This is a highly efficient new heating system. 这是个高效的新取暖系统。
