最好的话题，就是选择一个你熟悉的领域。在熟悉的主题中，优化它，使用幽默的语言，使听众产生共鸣。 ● An entry-exit route without intersections never to cul-de-sacs is a maximal established S of related internal details that go from a gate to a different (always different) gate and such that for all points p in S, there is only one way to maneuver on from p without https://infopagex.com/story12637046/new-step-by-step-map-for-%E6%BC%94%E8%AE%B2%E7%A8%BF%E4%BB%A3%E5%86%99