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From: MDBG CC-CEDICT Chinese-English Dictionary 漢英字典

 秒差距 [ㄇㄧㄠˇ ㄔㄚ ㄐㄩˋ; miao3 cha1 ju4]
 parallax second or parsec or pc, astronomic unit of distance, approx 3.26 light years