Description
BGM：Peaceful Days；Mimotronik；Assumptions；Battlefield Theme (Chamber Version)；闭环；太空漫步
参考资料（等待补充）：
https://www.ibanet.org/ip-july-2021-3d-object-video-games-ip
射击游戏：电子游戏如何为武器制造商提供资金 | Eurogamer.net --- Shooters: How Video Games Fund Arms Manufacturers | Eurogamer.net
Sandy Hook shooting: The unprecedented $73M settlement with gunmaker Remington - CBS News
NRA：韦恩·拉皮埃尔就纽敦枪击案发表完整声明 | 美国枪支管制 | 卫报 --- NRA: full statement by Wayne LaPierre in response to Newtown shootings | US gun control | The Guardian
