Where 3D printing was characterized by the new technologies and machinery, 4D printing is defined by the smart materials making waves in drug development and regenerative medicine.

中文翻译：

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保持聪明：这一切都与生物医学中的 4D 打印材料有关。

3D 打印的特点是新技术和新机器，而 4D 打印的特点是在药物开发和再生医学领域掀起波澜的智能材料。