"世界政治季刊" can be translated into English as "World Politics Quarterly".
Here, “世界” (shìjiè) means "world," “政治” (zhèngzhì) means "politics," “季刊” (jìkān) specifically refers to a "quarterly publication" (appearing four times a year). Thus, the combined term accurately conveys the meaning of a periodical focused on world politics published quarterly.