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States are rational actors that seek to maximize their relative power in order to ensure their survival in a competitive international system.
科学的挑战不仅在于找到答案,还要理解其更深层次的含义。
Every child deserves to see themselves in the stories they read.
当你为爱情而钓鱼时,要用你的心当作饵,而不是用你的脑筋。
The most sustainable building is the one that people love and care for.