不知道你用在日常还是书面,我就用日常说法翻译了。
翻译:You are like a sister I never have, sisters are forever.
sisterhood is a long-life thing. you are just like my sister
你是想说,朋友感情像姐妹那样么?
We are lifelong buddies, you are as close as my sisters.
Sister is a lifelong process. You are my sister of brotherhood