将“roundness"翻译成中文

Manholes are round because that way they won't accidentally fall through the hole.

人孔是圓的,因為這樣人孔蓋就不會意外地掉進洞裡。

It then comes back into a round form, and then tapers and curves off.

接着它慢慢变成了圆形, 然后逐渐变细。

Manholes are round because that way they won't accidentally fall through the hole.

人孔是圓的,因為這樣人孔蓋就不會意外地掉進洞裡。