tarnish

tarnish['tɑ:niʃ]

• vt.
  • 使(金属表面)失去光泽；使变灰暗：

    Salt tarnishes silver.

    盐可使银失去光泽。

  • 玷污，毁坏，糟蹋(名誉等)：

    The political scandal tarnished the reputation of the president.

    这起政治丑闻败坏了总统的名誉。

  • 使损坏；使低劣：

    to tarnish one's memory

    使丧失记忆

• vi.
  • 失去光泽；变灰暗：

    The silver spoon tarnished.

    银匙失去光泽了。

  • 被玷污；(威信等)降低：

    His reputation has tarnished in literary circles.

    他在文学界的声望已经下降了。

• n.
  • (金属表面的)无光泽；晦暗
  • 失泽的外表
  • 污点；瑕疵

• transglycosylase
• differential scanning calorimetry
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