v.(通常指金属)(使)失去光泽,(使)变灰暗( tarnish的过去式和过去分词 );玷污,败坏;
例句:
This kettle has become tarnished and needs cleaning.
这把水壶结垢了,需要清理一下.
His bad behaviour has tarnished the good name of the school.
他行为不轨,败坏了学校的声誉.
The reasons why the silver alloys tarnished are analyzed briefly.
简要分析了银合金变色的原因.