The amount of material one must read to conduct a reasonable review of a topic keeps growing.

随着论文数量激增，研究人员在开展课题前进行文献梳理所需要的阅读材料也在不断增加。

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Products are thus built up by progressively adding material, one layer at a time: hence the technology’s other name, additive manufacturing.

产品就是这样通过一层一层地叠加材料制造出来。这种技术于是被人称为“叠加式制造”。

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Products are thus built up by progressively adding material, one layer at a time: hence the technology's other name, additive manufacturing.

添加材料一次一层、步步为营直至成形，因此该技术又有了另一个名称：加法制造。

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Products are thus built up by progressively adding material, one layer at a time: hence the technology's other name, additive manufacturing.

添加材料一次一层、步步为营直至成形，因此该技术又有了另一个名称：加法制造。

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