The ruler used a ruler to draw straight lines.

统治者用尺子画直线。

It is not a ruler.

它不是尺子。

I also have an eraser and a ruler.

我还有一块橡皮和一把尺子。

I have two pencils, three pens, an eraser and a ruler in it.

我有两支铅笔、三支钢笔、一块橡皮和一把尺子在里面。

Measure the circ with a ruler.

用尺子测量这个圆周。

He drew a straight line with a ruler.

他用尺子画了一条直线。

Use a ruler to draw straight lines.

使用尺子画直线。

I used a ruler to draw a straight line.

我用尺子画了一条直线。

He used a ruler to draw a straight line.

他用尺子画了一条直线。

He measured the line segment with a ruler.

他用尺子测量了这条线段。