每日一句 英语句子

Its origin is still a mystery now.

它的起源至今仍是个谜。

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今天的几个句子是有关起源的：1.Speculate on the origin of the universe.探究宇宙的起源。2.The origin of Ruby Fall. 红宝石瀑布的起源。3.To investigate the origin of the misfortune.追究祸源。