cladding

1. N-UNCOUNT Cladding is a covering of tiles, wooden boards, or other material that is fixed to the outside of a building to protect it against bad weather or to make it look more attractive. 覆盖层[oft n N]

...stone cladding. ...石头的覆盖层。

2. N-UNCOUNT Cladding is a layer of metal which is put around fuel rods in a nuclear reactor. (裹在核反应堆内燃烧棒周围的)金属层