Sheffield plate
noun/ˌʃefiːld ˈpleɪt/
/ˌʃefiːld ˈpleɪt/
[uncountable]- a type of metal consisting of copper (= a soft red-brown metal) covered with a thin layer of silver. The method of covering copper objects with silver and then heating them to keep it in place was invented by Thomas Boulsover in Sheffield in the 1740s. It became an important industry because objects could be made of Sheffield plate much more cheaply than if they were made of silver.
谢菲尔德（Sheffield）板：一种金属，由覆盖有薄银层的铜组成。托马斯·布尔索夫（Thomas Boulsover）于1740年代在谢菲尔德（Sheffield）发明了用银覆盖铜物体然后加热使其固定的方法。它之所以成为重要的行业，是因为用谢菲尔德板制成的物体比用银制成的物体便宜得多。