tarnish

vt.& vi.

（通常指金属）（使）失去光泽，（使）变灰暗；

vt.

玷污，败坏；

n.

污点，瑕疵；无光泽，晦暗；

复数：tarnishes过去式：tarnished过去分词：tarnished现在分词：tarnishing第三人称单数：tarnishes

1. Moisture leads to the tarnish of the silverware.
   湿气使得银器毫无光泽。
2. Check cutlery to make sure them free from tarnish and stain.
   检查餐具的清洁,保证光亮无污渍。

1. The firm's good name was badly tarnished by the scandal.
   这件丑事玷污了公司的好名声。
2. If news of this gets out, it will tarnish his image.
   如果这消息传出去
3. These pessimistic predictions and doubts, however, cannot tarnish facts.
   但预测也好、疑问也罢，终究抵挡不住事实的光芒。

Tarnish evaluation of gold-based dental alloys
ENHANCING SILVER TARNISH-RESISTANCE
Formation and Growth of Tarnish on Evaporated Silver Films
Tarnish on the "gold standard": Understanding recent problems in forensic DNA testing
Optical Constants of Silver Sulfide Tarnish Films*
Application of SIMS to silver tarnish at the British Museum
Observations of onset of sulfide tarnish on gold-base alloys.
Tarnish protection of silver by octadecanethiol self-assembled monolayers prepared in aqueous micellar solution
The electrum-tarnish method for the determination of the fugacity of sulfur in laboratory sulfide systems ☆
Tarnish Protection of Silver Using a Hexadecanethiol Self-Assembled Monolayer and Descriptions of Accelerated Tarnish Tests