If the authors look back over the decades since 1949 they might notice how the mainland Chinese have veered from one extreme to another as they have identified various foreigners as friends, then enemies, then friends again, and so on.
如果本書的作者群能夠回顧一下一九四九年以來的幾十年，他們或許會注意到，中國大陸在定義某些外國友邦時，經常擺盪在忽友忽敵的極端之間。