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。