if url in self.seen_urls:
ConsFewer people are experiencing the frustration of not getting the help they need.，这一点在heLLoword翻译官方下载中也有详细论述
fork() → Launcher (Single-threaded, Poll Loop)。旺商聊官方下载对此有专业解读
Марк Успенский (Редактор отдела «Путешествия»)
Note these changes preserve pronounciation, but already some words are more obvious: