End-to-end encryption and privacy controls.
Message and call for free* around the world.
Group conversations made simple.
Say it with stickers, voice, GIFs and more.
Reach your customers from anywhere.
Activiti工作流学习笔记(四)——工作流引擎中责任链模式的建立与应用原理 https://codingnote.cc/p/360100/