Explainer: Why did Pelosi's visit cause a stir?

　　US House Speaker Nancy Pelosi's visit to Taiwan sparked outrage across China.
　　Her trip was viewed by many as a violation of the one-China principle.
　　What is the one-China principle? Why such a strong reaction? And why does China maintain Taiwan is an inalienable part of its territory?
　　Let's break down the facts and take a brief look at history.
　　Host: Ian Goodrum
　　Video editor: Ma Chi, Yan Maoqiang, Cao Zinan
　　Supervisor: Wang Jianfen
　　Executive producer: Han Lei, Zhang Chunyan
　　Producer: Wang Hao
　　编辑：袁筱