关于友谊的英语美句，综合权威资料整理如下：

一、经典哲理类

1. "True friendship isn't about being inseparable, it's being separated and nothing changes."（真正的友谊不是形影不离，而是即使分离情意不变）

2. "Friendship is love with understanding."（友谊是爱与理解）

3. "A friend in need is a friend indeed."（患难见真情）

二、情感共鸣类

1. "Between friends all is common."（朋友之间不分彼此）

2. "The world is not so wide, without a friend."（没有朋友，世界如同荒野）

3. "In the moments of joy and sorrow, a friend is there to share."（在快乐与悲伤中，朋友都是分享者）

三、诗意表达类

1. "Friendship is the wine of life； treasured more by the more candid and mature."（友谊是生活的酒，越真诚越珍贵）

2. "A true friend is one who walks in when the rest of the world walks out."（真正的朋友在世界离开你时出现）

3. "If you feel lonely, look up at the stars； one is for luck, the other for you."（若感孤独，仰望星空，有一颗是为你的幸运星）

四、哲理比喻类

1. "Friends are like diamonds - bright, precious and always in style."（真正的友谊如钻石般永恒闪耀）

2. "Friendship is like a good book； the more you read, the more you love."（友谊如好书，越品越有味道）

3. "A friend is like a mirror； not the one who looks good, but the one who sees you."（真正的朋友是能看清你的镜子）

这些句子覆盖了友谊的多个维度，既有对情感本质的洞察，也有对时光沉淀的感悟，适合用于表达友情、书写贺卡或作为人生感悟的素材。