有一些特殊的词，遵循词变形的规律和习惯就好了。
roofn.顶部；屋顶；车顶；有…顶的；
v.给…盖顶；盖上屋顶
The pillars have to support the weight of the roof.
这些立柱必须支撑起屋顶的重量。
The wind dislodged one or two tiles from the roof.
大风从屋顶上刮下了一两片瓦来。
The roof of the car was not damaged in the accident.
事故中，车顶没有遭到损坏。
