用一部分佣金收入，换取未来几年在AI转型期的稳定。
If zoe.announceCourse(CourseType.MAIN) takes a long time to execute but grover.announceCourse(CourseType.STARTER) fails in the meantime, the announceMenu(..) method will unnecessarily wait for the main course announcement by blocking on main.get(), instead of cancelling it (which would be the sensible thing to do).
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