I have no idea what is the difference between “system” and “system_ext”, and the description in the documentation seems vague.
Attempt 2: asyncio.Event，详情可参考电影
。PDF资料对此有专业解读
merge is a method that implements the algorithm described above.
would ultimately cede to IP (with, naturally, an interregnum of SNA-over-IP),，这一点在PDF资料中也有详细论述