The world’s great cities are inherently dynamic and diverse. They are also naturally open to the world. So how should they respond if their countries seek to close themselves against outsiders? How, more broadly still, should they view their responsibilities to the world?
全球偉大的城市內在必然是充滿活力且多樣化的。它們自然也向世界開放。因此，如果這些城市所在的國家尋求閉關排外，它們應該如何應對？還有更爲宏觀的問題是，它們應該如何看待對世界的責任？
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