北上广深

běi shàng guǎng shēnbeishangguangshen

Beijing, Shanghai, Guangzhou and Shenzhen (abbr. for 北京[Bei3 jing1] + 上海[Shang4 hai3] + 廣州|广州[Guang3 zhou1] + 深圳[Shen1 zhen4])

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Data from JMdict, KANJIDIC2 (EDRDG), KanjiVG, CC-CEDICT and Make Me a Hanzi. Sources and licences