域: 名词(在一定疆界内的地方; 疆域) land within certain boundaries; territory; region 短语和例子定义域 domain; 海域 sea area; maritime space; 绝域 inaccessible remote areas; 领域 territory; domain; field; realm; 异域 forei
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
