What is "someone you can't live without"?

來源: zhenghueng 於 2010-04-26 15:02:38 [] [舊帖] [給我悄悄話] 閱讀數 : (188 bytes)
本帖於 2010-09-28 08:04:20 時間, 由超管 論壇管理 編輯
回答: "通奸"算愛情嗎？ 由 zhenghueng 於 2010-04-26 14:29:36

如何定量描述？For example, there are two real roots when b*b-4*a*c>0, while there are two complex roots when b*b-4*a*c

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