@DailyJLee Various zero-targeting countries tried to do travel corridors which could have evolved into a bubbling out. However, most ended up being delayed, revoked, or cancelled because of outbreaks (from outside) on one side. Tiny bubbles still on the wrong side of bistable.
@DailyJLee各个零目标国家都试图打造旅游走廊，这可能会演变成一个泡沫。然而，由于一方（来自外部）的疫情爆发，大多数最终被推迟、撤销或取消。小气泡仍然在双稳态的错误一侧。