這甚至促使小報以「動盪軸心」（axix of upheaval）將中國和伊朗歸為一類，加上朝鮮與俄羅斯。四者確實都意在挑戰美國主導的國際秩序，但實際上它們彼此的關係更接近交易導向。
Borusyak, Kirill, Peter Hull, and Xavier Jaravel, "Quasi-experimental shift-share research designs," The Review of Economic Studies, 2022, 89 (1), 181–213.
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