名词 straightedge:

1. hand tool consisting of a flat rigid rectangular bar (metal or wood) that can be used to draw straight lines (or test their straightness)

straight to直达straightadj.直的；坦率的；正直的；准的；连续的；异性恋的adv.笔直地；直接；坦率地；连续不断地n.直的东西；传统的人；异性恋者straight half round scraper直头半圆刮刀straight-line link motion直线连杆运动straight arteries of kidney肾直小动脉straight forward expression直接框架表达straight-line seam welder直线滚焊机straight serre-fines clip直形有齿精细夹straight-line tunnel kiln直线隧道式窑straight cylindrical bobbin圆筒形筒子straight petroleum products纯石油产品straight-tooth bevel gear直齿伞齿轮

1. The child used a ruler to draw straight lines.
   这孩子用一把直尺划直线。
2. We draw a straight line on the paper with the straightedge, according to the European several Reed plane geometry principle, we said that it is a straight line.
   我们在纸上用直尺画一条直线，按照欧几里德平面几何原理，我们说它是一条直线。