常見例句Someone is working in the manhole. 有人在（鍋爐的）檢脩孔中工作。I need to find a manhole tool... 我需要找個通道蓋子工具...Here's the question: Why are manhole covers round? 這個問題是：爲(wèi)什麼下水道井蓋都是圓的?Or the manhole cover outside your apartment? 還是你公寓外麪的下水井蓋?Why are manhole cover round in shape? 點解下水道的蓋是圓形的?Please move the manhole cover away. 請將人孔蓋移開。 返回 manhole