翻釋做英文

直譯版:
Coil the pencil with a piece of wire for one turn.
Then put the wire onto a ruler.
Then the circumference of the pencil is known.

完整版: (加多幾個step, 更加完整)
Coil the pencil with a piece of wire for one turn.
Mark the place where the coiled end of the wire meets with the wire.
Then, straighten the wire and measure the mark with a ruler.
Hence, the circumference of the pencil is known.

用鐵絲將鉛筆綁一圈,然後把(拉直了的)鐵絲放在間尺上,就知道(找到)鉛筆的圓周有多長。

加入(拉直了的)和改(知道)為(找到)意思可能清楚些。英譯如下：

Use a steel wire to wrap around the pencil once. Then put the (straightened)wire along a ruler and you will know(find out) how long the circumference of the pencil is.

OR

Use a steel wire to wrap around the pencil once. Then measure the straightened wire on a ruler and you will find out what the length of the circumsference of the pencil is.

翻釋做英文就應該係:

With a sky will pencil tied a ring,and then the iron - and - drop in ruler on the,you know that pencil depends how long.

我唔係好肯定!

Coil the pencil with a piece of wire for one turn.
Mark the place where the coiled end of the wire meets with the wire.
Then, straighten the wire and measure the mark with a ruler.
Hence, the circumference of the pencil is known.

Ties up with the iron wire the pencil, then puts the iron wire on
ruler on, knew the pencil the circumference has long

Will be tied with wire around a pencil, and then the wire on the rulers, knew how long the circumference of a pencil.