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
误差: error 短语和例子平均误差 mean error; average error; 仪器误差 instrumental error; 概然误差 probable error; 行星观测上位置与计算上位置间的误差 the error of a planet; 误差极微的精密零件 precision parts with very close tolerances; 误差不超
