20180803

3D printing

又称增材制造、积层制造（英语：Additive Manufacturing，AM）

背景补充：

2013年，美国人威尔森推出全世界第一把3D打印枪支。2018年8月1日起，3D打印枪支在美国合法化。

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三D打印技术为何危险？

3D-printed guns are alarming for two reasons:

they are untraceable,无法溯源

lacking serial numbers, and they can slip through metal detectors.

无法探测和管控

美国管控枪支的阻力来自

第一NRA National Rifle Association

one of the most powerful group in US, which strongly support the right of owning guns

第二是Cody Wilson这样的无政府主义者，The anarchist like Cody Wilson take use of the free-speech right to distribute his instruction of 3-D printed guns

, which will make gun control even harder.

伴随状语的两种逻辑

原因，The reasons: They r untraceable, lacking serial numbers.

方式，Trump weighed in, tweeting that he was "looking into" the matter.

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3D printing: 3D 打印

3D print: 3D 打印

3D-printed: adj. 用 3D 打印出来的

3D printer: 3D 打印机

the age of sth. formally begins: ……的时代正式开始了

Defense Distributed: 分布式防御组织

anarchist: n. 无政府主义者

handgun手枪

seek to do sth.: 设法做某事；试图做某事

legal battle: 法律抗争；官司

comply: vi. 遵从；顺从

on … grounds / on the grounds of … / on the grounds that …: 以……为理由，基于……理由 (通常用于法律语境中)

free speech: 言论自由

settle: vi. 达成协议；和解

in one's favour: 对……有利；支持……

file a suit (against): 起诉

alarming: adj. 让人害怕／惊慌的

untraceable: adj. 无法追溯的

· trace: vt. 追溯；探索

The book traced the history of private gun ownership in the US.

这本书追溯了美国私人持枪的历史。

· trace back to 回溯到，追溯到

The history of private gun ownership can trace back to American Revolutionary War.

美国私人持枪的历史可以追溯到独立战争时期。

serial number: 序列号

slip through: 蒙混过关

· slip through the net 漏网；成为漏网之鱼

weigh in: (对某事) 发表看法/施加影响

look into ...: 调查/深入检查……

NRA / National Rifle Association: 美国全国步枪协会

It is the 【 culmination / peak  /  climax  】of a three-year legal battle.

His misdoings would only cultimate in tragedy.