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jan 1, 202 BC - 【西汉】 设立河西四郡=张掖、酒泉、敦煌（汉武帝），武威（昭、宣） 开辟了通往印度洋的海路 初步形成东、南两条航线： 东线：朝鲜半岛、日本 南线：印度洋

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人教版高中历史|Chinese students' PEP SENIOR HIGH HISTORY TEXTBOOKS

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jan 1, 202 BC
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~ 2228 years ago
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