The best uses of 3D printers and virtual reality haven't been invented yet.
3D打印机和虚拟现实的最佳用途尚未被发明出来。
Self-sliding doors began to emerge as a commercial product in 1960 after being invented six years 4 by two Americans Dee Horton and Lew Hewitt.
自动滑动门在 1960 年开始作为商业产品出现，这在六年后第 4 年由两位美国人Dee Horton和Lew Hewitt发明。
例句取自历年考研英语真题，翻译为机器生成，仅供学习参考。