这是问题：为什么下水道井盖是圆的？
本实用新型是对铁骨架混凝土结构下水道井盖的改进。
The utility model relates to the improvement on a manhole cover with an iron skeleton concrete structure.
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。
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。
A 40 kg sewer lid can be sold on the black market for roughly 6 euros (4 pounds), Goffaux said. "we."
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？”
Microsoft is famous for asking puzzle-type interview questions, and the most famous one is "why are manhole covers round?"
铸铁井盖主要是被应用在城市下水道中，但造成其质量问题的因素在哪些？
The main cast iron manhole cover is being applied in the sewers of the city, but the cause of quality problems in what factors?
街道可找到井盖，由此进入下水道杀怪物，在里面可找到一些装备和金钱。
Streets can be found in the covers, which enter the sewers to kill a monster, which can be found in some equipment and money.
如果井盖的设计得不到改良，其重量得不到增加，那么下水道中积聚过多的甲烷气体将井盖吹起并砸毁汽车的事件就会继续上演…
Manhole covers are deliberately heavy to prevent them being blown off by a build-up of methane gas from the sewers below.
如果井盖的设计得不到改良，其重量得不到增加，那么下水道中积聚过多的甲烷气体将井盖吹起并砸毁汽车的事件就会继续上演…
Manhole covers are deliberately heavy to prevent them being blown off by a build-up of methane gas from the sewers below.
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