manhole covers短语⁵⁸⁹⁶⁸ 基本例句 n.井盖；人孔盖；探检查🌏井盖抱枕；下水道盖子；沙井盖原型manholecover的复数 Customer is complaining the packing, he said the container has a strong fumigation smell, and many manhole covers are rusty. 客户抱怨包装问题，他说集装箱里有浓烈的的烟熏味，而且许多下水道井盖都生锈了。 kuaiyilin Here's the question: Why are manhole covers round? 这个问题是，下水道的井盖为什么是圆的？ luopo