Фото: Soe Zeya Tun / Reuters
这一行代码将Pet声明为新类型，其变量可存储Cat、Dog或Bird。编译器提供从各案例类型的隐式转换，因此可以直接赋值：
。WhatsApp网页版对此有专业解读
Under the new rules, search engines, app stores, social media and gaming platforms, porn sites and AI systems - including companion chatbots - must take "meaningful steps" to prevent children from being exposed to adult content.
Original publication appeared on Fortune.com