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Unit 4-1 Doughnut Holes and Puzzle Pieces: When Borders Break the Rules
有些國家的邊界，就像一顆甜甜圈中的洞，或是一塊散落在遠方的拼圖。這些看似不合常理的邊界，其實有各自的專有名詞：內飛地與外飛地。想知道哪些地方就是這些「不尋常的邊界」嗎？
