Only in a flat universe does space obey all the standard geometry-class rules-the angles of a triangle add up to exactly 180 degrees and parallel lines never meet.
只有在平坦的宇宙中，空间才符合标准的几何规律——三角形的内角和精确地等于180度，平行线永远不相交。
Then the goal, content and three angles of mechanism of manpower resources development are sprawled vertically in the class manages, make up the main framework of the full text.
然后从班级管理中人力资源开发的目标、内容和机制三个角度纵向铺展开来，组成全文的主要构架。
The teaching practice has showed that it is helpful to use the object in class on the topic of 'Euler Angles "."
教学实践表明：它的使用大有助于“欧勒角”课题的直观教学。
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