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
床: i 名1.(供人睡觉的家具) bed; couch 短语和例子单[双]人床 single [double] bed; 吊床 suspended bed; hammock; 帆布[折叠] 床 camp [folding] bed; 小孩床 child's cot; baby's crib;卧病在床take to one's bed; be laid up in bed; 上床
