大多数美国人通常天真、率直，友好坦率，喜欢结识人，欢迎客人来访，愿意召集正式的或非正式的聚会。
Most Americans are usually spontaneous, friendly and open, and enjoy meeting new people, having guests and ringing people together formally or informally.
客座演讲来宾经常来访，课程多以非正式的形式讨论。
Guest speakers visit frequently, and classes are largely devoted to informal discussion.
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