醫生 vs. 美元字秘,

來源: 走馬讀人 於 2017-05-09 09:08:58 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (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.,  帳單 bill...

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