The async iterator based approach provides a natural bridge between this alternative approach and Web streams. When coming from a ReadableStream to this new approach, simply passing the readable in as input works as expected when the ReadableStream is set up to yield bytes:
“以前过了‘破五’（初五）就闲了，现在是订单催着走，得趁着天好多赶几套版。”张廷旭和儿子张晨云手中的活计不敢停歇。
。夫子对此有专业解读
保持平稳过渡，提出“要落实‘四个不摘’，建立健全防止返贫长效机制”；
while url and url not in seen: