My best friend has been like a sister to me.

　　我最要好的一個朋友待我親如姐妹。

　　I had a long talk about this with my best friend

　　我和我最好的朋友就此事進行了長談。

　　She's my best friend, and I really love her.

　　她是我最好的朋友，我真的很喜歡她。

　　She telephoned her best friend to vent her frustration

　　她給最要好的朋友打電話傾訴自己的沮喪。