What is the most useful invention of the digital age?

数字时代最有用的发明是什么？

同一单元的其他句子

• The internet connects people all over the world instantly.互联网即时连接世界各地的人们。
• Can you show me how to use this new app?你能教我如何使用这个新应用吗？
• I don't think technology always makes life easier.我不认为科技总是让生活更轻松。
• Please turn off your computer before you leave the office.离开办公室前请关闭电脑。
• Many people shop online instead of going to stores.许多人网购而不去商店。