Bats usually hang upside down. "To hang around" means to spend time with someone, so these bats are hanging around (upside down) together.
蝙蝠一般倒掛在洞穴內。Hang是掛,hang around本來指「到處逛」,現在倒真的是「倒過來掛」了。■漫畫&說明︰英國文化協會
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