1. The string is wound round a cardboard cylinder.
    线缠绕在纸筒上.

2. It cuts a clean cylinder of rock, from which can be seen the strata the drill has been cutting through.
    它切割出一块表面光滑的圆柱体石头, 从这石块上可以看出钻头在切割的岩层.

3. It cuts a clean cylinder of rock, from which can be seen the strata the drill has been cutting through.
    这种钻头能切割一段光滑的圆柱形岩石，从中能看出所钻透的地层。

4. I was looking into a 6-meter-high cylinder(圆柱体) of netting with a wire net floor.
    我的前方是一个六米高的网状圆柱形空间，底部是金属丝编成的网。