1.
This is the ruler[ with that] you can draw a straight line.
③这就是那把尺子，您可以用它划一条直线。
2.
and drew a line down the middle of it from top to bottom.
在写字板正中间从上到下划了一条直线。
3.
In a vertical or perpendicular line.
垂直地在一条垂直线或竖直线上
4.
He added up the list of figures and ruled it off neatly.
他将那一栏数字加起来，之后很整洁地在下面划了一条直线。
5.
scratch a line on a surface
在物体表面划出一条线
6.
One line cuts another at right angles.
一条线与另一条线成直角相交。
7.
A line cuts another at right angles.
一条线与另一条线相交成直角。
8.
These two lines form a right angle.
这两条线成一直角.
9.
AB is a line perpendicular to CD .
AB是一条垂直cd的线。
10.
A line that deviates from straightness in a smooth, continuous fashion.
曲线一条光滑并连续地偏离直线的线
11.
"curve:a line that deviates from straightness in a smooth, continuous fashion."
曲线:一条光滑并连续地偏离直线的线.
12.
The child used a ruler to draw straight lines.
这孩子用一把直尺划直线。
13.
a straight line that is not at right angles to a side.
与一条边不形成直角的直线。
14.
To construct(a perpendicular, for example) from or on a given base.
作一垂直线从某一给定基线建（如一条垂线）
15.
The plot/graph of I versus V is a straight line.
I随v的变化曲线是一条直线
16.
a straight line that touches but does not intersect a curve.
和曲线接触但不相交的一条直线。
17.
A line or plane perpendicular to a given line or plane.
正交线（面）一条或一个与给定直线或平面垂直的直线或平面
18.
A straightedged strip, as of wood or metal, for drawing straight lines and measuring lengths.
尺，直尺，划线用木头或金属等制成的直角的条，用于划直线和测量长度