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Transcript:
A fully functional gun made with a 3D printer.
The controversial group who designed the firearm want to make it available online.
Anti-gun campaigners have criticised the project; while law enforcement agencies are monitoring developments.
3D printing has been hailed as the future of manufacturing, and works by building up layer upon layer of material to make solid objects.
Vocabulary:
fully functional 充分发挥功能
firearm n. 火器；枪炮
anti-gun campaigners 枪支活动参与者
law enforcement agencies 执法部门
hailed as 被誉为
