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
离: Ⅰ动词1.(离开) leave; part from; be away from; separate 短语和例子远离家乡 go far away from home; 别离 be separated; 离连赴京 leave dalian for beijing; 她离家已经多年了。 she's been away from home for many years.2.(背离
