both derivatives and intersection/complement operators originally came from a 1964 paper by Janusz Brzozowski (below).
If you live in an apartment, dorm, or a duplex, you probably have set quiet hours. Ignoring these can come with angry neighbors or warnings from the landlord. But it's not always easy on Saturday night when belting out Britney Spears karaoke songs to keep track of the time. Instead of getting a knock on your door at 11 p.m., set your speaker or the TV to automatically lower the volume at a set time. Your party will automatically get the memo that it's time to wind down.
，这一点在同城约会中也有详细论述
Фото: Stringer / Reuters，更多细节参见clash下载
# the setter use `call_soon_threadsafe` for cross-thread notification.，详情可参考纸飞机官网