下水道井盖

Here´s the question: Why are manhole covers round?

这是问题：为什么下水道井盖是圆的？

The utility model relates to the improvement on a manhole cover with an iron skeleton concrete structure.

本实用新型是对铁骨架混凝土结构下水道井盖的改进。

A 40 kg sewer lid can be sold on the black market for roughly 6 euros (4 pounds), Goffaux said.

戈福说，目前，黑市上一块重达40公斤的下水道井盖可以卖到大约6欧元。

Microsoft is famous for asking puzzle-type interview questions, and the most famous one is ´why are manhole covers round?´

微软总喜欢提出各种各样的面试问题，其中最有名的是“为什么下水道井盖是圆的？”

Customer is complaining the packing, he said the container has a strong fumigation smell, and many manhole covers are rusty.

客户抱怨包装问题，他说集装箱里有浓烈的的烟熏味，而且许多下水道井盖都生锈了。