What are the 3 agents of #Mercury?
1⃣ User Agent:
A user agent is under the control of some end entity, and can be built as or embedded into mobile apps or other rich clients. It is worth noting that user agents have a most important feature that they cannot be online for 24/7.
#Mercury的三种药剂是什么？
1.⃣ 用户代理：
用户代理受某些终端实体的控制，可以构建为移动应用程序或其他富客户端，也可以嵌入其中。值得注意的是，用户代理有一个最重要的特性，即他们不能全天候在线。