• "Rough square, fine into light", had to first thick hind fine sand board.

    “粗成方,细成光”,过砂板要先粗后细。

    youdao

  • "Rough square, fine into light", had to first thick hind fine sand board.

    “粗成方,细成光”,过砂板要先粗后细。

    youdao

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