传教士曾引进过拉丁文铅活字印刷和铜雕版印刷，但对中国印刷业没有产生实质性影响。

Though the missionaries introduced lead type printing and bronze block printing in latin, the introduction did not make substantive impact on Chinese printing industry.

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薄空铅：相等于正方五分之一的活字间隔材料。

Thin space: A type spacing piece equal to one-fifth of an em.

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