英语翻译下下面这段文字吗,要语法正确.一条比较长的直线,需要多次调整尺子,而这种尺子不需要,它是利用了导轨原理,它分两部

Now,I introduce a ruler,the ruler can draw a straight line of infinite length,is this.
General ruler to draw a straight line longer need several adjustments ruler,and this ruler is not needed,
It is the use of the rail principle,it is divided into two parts,a ruler,a fixed block,between the two parts a slide,when the unfinished part of the straight after the use of linear movement of the fixed block with a ruler,you can continue to draw a straight line.
The above is about the introduction of this ruler,thank you.