日韩大陆av,av激情亚洲男人的天堂国语,中文欧美亚洲欧日韩范冰冰,国产成人AV免观看

文字稿:

A fully functional gun made with a 3D printer.

The controversial group who designed the firearm want to makeit 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 詞匯:

fully functional 完全可以使用的

firearm 手槍

anti-gun campaigners 參加反對(duì)槍支運(yùn)動(dòng)者

law enforcement agencies 執(zhí)法機(jī)構(gòu)

hailed as 被稱為