揭示了坐标几何学;,当你在学校学习X轴和Y轴的时候,它们被叫作笛卡尔坐标，那就是以他的名字来命名的。
He discovered co-ordinate geometry; so in school when you are learning about x and y coordinates and they were called Cartesian coordinate that's after Descartes.
因此，在笛卡尔平面使用x轴时，考虑一个特定的细胞为原点。
So, as you do with the x-axis in the Cartesian plane, you consider a particular cell to be the origin.
摘要分析了透明圆形截面纤维在垂直纤维轴光线照射时纱维内表面反射光的一种特殊现象—笛卡尔线现象。
An analysis is made about Descartes rays of transparent round-section fibers-a special internal surface reflection rays of the fiber when parallel rays strike the fibers perpendicularly to fiber axis.
分析了透明圆形截面纤维在垂直纤维轴光线照射时纱维内表面反射光的一种特殊现象？笛卡尔线现象。
An analysis is made about Descartes rays of transparent round-section fibers-a special internal surface reflection rays of the fiber when parallel rays strike the fibers perpendicularly to fiber axis.
分析了透明圆形截面纤维在垂直纤维轴光线照射时纱维内表面反射光的一种特殊现象？笛卡尔线现象。
An analysis is made about Descartes rays of transparent round-section fibers-a special internal surface reflection rays of the fiber when parallel rays strike the fibers perpendicularly to fiber axis.
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