Please move the manhole cover away.
请将人孔盖移开。
Why are manhole cover round in shape?
点解下水道的盖是圆形的？
One day he went down to the manhole again.
一天他又钻进下水道。
Here's the question: Why are manhole covers round?
这是问题：为什么下水道井盖是圆的？
It's possible that you could inadvertently step into an open manhole.
很可能你不小心就会掉进敞开的下水道口。
In theory, ductile iron manhole cover when installed, should be a whole.
在理论上说，球墨铸铁井盖在安装的时候，应该是一个整体。
Cast iron manhole cover of good quality is to see its toughness and hardness.
质量好的铸铁井盖是要看其韧度和硬度的。
At the same time, the manhole cover has the characteristics of insulation, noise free.
同时，这种井盖还具有绝缘、无噪声的特点。
Manhole, observation hole and measure hole are set on the wall.
炉墙上设有人孔门、观察孔和测量孔。
Manhole, observation hole and measure hole are set on the wall.
炉墙上设有人孔门、观察孔和测量孔。
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