rare printing的意思|示意

Designer Campbell Rey expects 3d printing to be the new norm: allowing us to print marble, rosewood, and other materials considered rare.

设计师坎贝尔·雷伊期认为3d打印将会有新的形式：我们可以打印大理石、红木和其他稀有材料。

Before the invention of printing, books were very rare and expensive.

印刷术的发明之前，书非常罕见和昂贵的。

Before the invention of printing, maps like Ptolemy's were rare and expensive because they had to be hand drawn.

印刷术发明以前，类似托勒密所制的地图很少见，而且价格不菲，因为当时的地图必须以手工绘制。