检修孔

• Though their function is to cover the holes in streets through which sewers , drains and other structures are reached ; manhole covers have long been admired for their beauty
  虽然它们的功能只是遮盖街道上的下水道、排水沟或者其他地面设施的检修孔，但井盖的精美设计长期以来就一直受人们赞赏。