醫生 vs. 美元字秘,

来源: 走马读人 于 2017-05-09 09:08:58 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (283 bytes)

矢量 Vector a quantity having direction as well as magnitude, especially as determining the position of one point in space relative to another.,  帐单 bill...

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