闭: Ⅰ动词1.(关; 合) close; shut 短语和例子关闭 close; 停闭 close out; 封闭 seal off; close; 闭嘴! shut up!; hold your tongue!2.(堵塞不通) block up; obstruct; stop up 短语和例子闭住气 hold one's breath; stop breathingⅡ名词(姓
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
