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

来源: zhenghueng 于 2010-04-26 15:02:38 [] [旧帖] [给我悄悄话] 阅读数 : (188 bytes)
本帖于 2010-09-28 08:04:20 时间, 由超管 论坛管理 编辑
回答: "通奸"算爱情吗？ 由 zhenghueng 于 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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