每日一句：Its origin is still a mystery now.
http://file.xdf.cn/uploads/161020/230_161020151112DbdOFcpXx2wY2kpF.mp3句子：Its origin is still a mystery now.
它的起源至今仍是个谜。
解析：mystery的意思是谜，神秘，形容词是mysterious,因此这句话也可以说成Its origin is still mysterious
now.
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