纯: 形容词1.(纯净; 不含杂质) pure; unmixed 短语和例子纯白 pure white; 纯黑 all black; 纯金 pure [solid] gold; 纯毛 pure wool2.(纯粹; 单纯) simple; pure and simple 短语和例子纯属捏造 sheer fabrication3.(纯熟) skilful; practised; w
垂直: perpendicular; vertical; squareness; verticality; perpendicularity 短语和例子两线垂直相交。the two lines meet at right angles. 设 ab 垂直于 cd。let ab be perpendicular to cd. 当表面与射线垂直时，射线的强度最大。when a surfa
