chore: update README

README.md

@@ -18,8 +18,18 @@
 
 [8]: https://github.com/HyNetwork/hysteria/discussions
 
-Hysteria is a feature-packed proxy & relay utility optimized for lossy, unstable connections (e.g. satellite networks,
-congested public Wi-Fi, connecting from China to servers abroad) powered by a customized QUIC protocol.
+Hysteria is a feature-packed proxy & relay tool optimized for lossy, unstable connections (e.g. satellite networks,
+congested public Wi-Fi, connecting to foreign servers from China) powered by a customized protocol based on QUIC.
+
+## Use cases
+
+- Censorship circumvention
+- Boosting slow connections
+- Bypassing commercial/academic/corporate firewalls
+- Bypassing ISP throttling
+- ...
+
+## Modes
 
 - SOCKS5 proxy (TCP & UDP)
 - HTTP/HTTPS proxy
@@ -33,7 +43,16 @@ congested public Wi-Fi, connecting from China to servers abroad) powered by a cu
 
 ----------
 
-Hysteria 是一个功能丰富的，专为恶劣网络环境进行优化的网络工具（双边加速），比如卫星网络、拥挤的公共 Wi-Fi、在中国连接国外服务器等。 基于修改版的 QUIC 协议。
+Hysteria 是一个功能丰富的，专为恶劣网络环境（如卫星网络、拥挤的公共 Wi-Fi、从中国连接境外服务器等）进行优化的双边加速工具，基于修改版的 QUIC 协议。
+
+## 常见用例
+
+- 绕过网络审查
+- 提升传输速度
+- 绕过商业/学校/企业防火墙
+- 绕过运营商 QoS 限速
+
+## 模式
 
 - SOCKS5 代理 (TCP & UDP)
 - HTTP/HTTPS 代理