In each discussion, one group is given the task of offering ideas, a "shadow" group that of shooting them down.
每次讨论，一组的任务是提出意见，另一组则要“拍砖”反驳。
It used to be the default plot for space sci-fi movies–aliens invading Earth and soldiers shooting them with laser guns.
外星人入侵地球，地球勇士用镭射枪回击，这曾是科幻电影的标配情节。
It used to be the default plot for space sci-fi movies–aliens invading Earth and soldiers shooting them with laser guns.
外星人入侵地球，地球勇士用镭射枪回击，这曾是科幻电影的标配情节。
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