while url and url not in seen:
Start a stopped container
，更多细节参见搜狗输入法2026
Stream implementations can and do ignore backpressure; and some spec-defined features explicitly break backpressure. tee(), for instance, creates two branches from a single stream. If one branch reads faster than the other, data accumulates in an internal buffer with no limit. A fast consumer can cause unbounded memory growth while the slow consumer catches up, and there's no way to configure this or opt out beyond canceling the slower branch.，这一点在雷电模拟器官方版本下载中也有详细论述
# 使用装饰器模式组合存储（同时写入DB和CSV）