烟: Ⅰ名词1.(物质燃烧时产生的气体) smoke 短语和例子毒烟 toxic smoke; 褐烟 brown smoke; 蓝烟 cold smoke; 高高的烟囱喷吐出黑烟。 tall chimneys belch [vomit] forth black smoke. 满屋子都是烟。 the room was full of smoke. 烟从烟囱里袅袅升起。 the sm
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
