Cách sử dụng
A manhole is a type of opening on the road or sidewalk that allows people to enter or access something underneath, such as a sewer, water supply, or electrical system. They are usually round or square and made of metal or concrete. If you're walking on the street and see a small cover with a handle, that's probably a manhole. It's important to watch out for them and not step on or into them because they can be very dangerous. So, whenever you see a small hole on the road or sidewalk, it might be a manhole, which should be avoided for safety.