常見(jiàn)例句Someone is working in the manhole. 有人在（鍋爐的）檢修孔中工作。I need to find a manhole tool... 我需要找個(gè)通道蓋子工具...Here's the question: Why are manhole covers round? 這個(gè)問(wèn)題是：為什么下水道井蓋都是圓的?Or the manhole cover outside your apartment? 還是你公寓外面的下水井蓋?Why are manhole cover round in shape? 點(diǎn)解下水道的蓋是圓形的?Please move the manhole cover away. 請(qǐng)將人孔蓋移開(kāi)。 返回 manhole