par·a·sang /ˈpærəˌsæŋ/
 古代波斯的距離單位
 Par·a·sang n.  A Persian measure of length, which, according to Herodotus and Xenophon, was thirty stadia, or somewhat more than three and a half miles.  The measure varied in different times and places, and, as now used, is estimated at from three and a half to four English miles.
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