1 sentence

1. 最初这些卡片是由工厂工人手工着色的。

   zuì​chū zhè​xiē kǎ​piàn shì yóu gōng​chǎng gōng​rén shǒu​gōng zhuó sè de.

   Initially these cards were hand-colored by factory workers.

   Source: CCMatrix