直线的英文：
straight line
参考例句：
Linear interpolation
直线切削Draw a line perpendicular to a given line
作一直线与已知直线垂直Draw a straight line
划一条直线The final/finishing/home stretch
临近终点的直线跑道In line
成一直线,排成一行In line with
和...成直线,排成一行Light is propagated through space in a straight line.
光以直线经由空中传送。The straight-line method normally is used for amortizing intangible assets.
摊销无形资产通常用直线折旧法。A secant is defined as line passing through two points of the curve.
割线的定义是一条通过曲线上两点的直线。tThe lines ab and CE intersect at E
ab与CE两直线相交于E点。straight是什么意思：
adj. 直的；正直的；直率的；连续的；整齐的
adv. 直接地；坦率地；立即；不断地
n. 直线
straight or on the rock
纯的或加冰块 make(sth)straight or level
使（某物）变直或变平 Straight trees have crooked roots
直树也有曲根You cannot be lost on a straight road
走直路,不迷途These trees are noted for their straightness and hardness.
这些树的特点是树干挺直，木质坚硬。line是什么意思：
n. 线条，界线，路线；条纹；排；铁路线；生产线；台词；态度；防线；前线
v. 用线标出，划线于；使布满纹络；加衬里于；排队，排列成行
This is a lined trunk.
这是一个有衬里的`箱子。 They are politically in line.
他们在政治上意见一致。On a map there are horizontal lines and vertical lines.
在地图上有水平的线和垂直的线。To inscribe(a line or lines)with a pencil or other marking implement.
画用铅笔或其它做标记的器具刻线The new proposal is in line with our general line.
新建议和我们总的原则是一致的。
