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  1. oil spot

    • n.
      an oily patch or mark.;a silvery marking on brown Chinese porcelain (especially of the Sung period) caused by precipitation of iron in firing
    • noun: oil spot, plural noun: oil spots

    • 釋義

    名詞

    • 1. an oily patch or mark.
    • a silvery marking on brown Chinese porcelain (especially of the Sung period) caused by precipitation of iron in firing oil-spot glaze
  2. 知識+

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      ... by the delay release problem. The problem has been spotted last year. We investigate the root cause is the inside iron core has oil-leaking problem, and it becomes adhesive. Adhesive inside iron...