使用了Only + 从句 + 倒装结构（can truly be called），强调了共同兴趣这一条件的唯一性和重要性。
The finest thing in life is the friendship one shares with others. — Lincoln
I would rather share a meal of coarse food with a good person than sit at a banquet with a bad one. — Thomas Fuller
The true test of friendship is not in words but in actions; those who speak the most flattering words are often furthest from meeting this standard. — Washington
Not all relatives are friends; Only those who share common interests can truly be called friends.
Friendships built upon business foundations are superior to businesses built upon friendship. — Rockefeller
Oh, friend, this is my heartfelt truth. Because of you, the blue sky feels boundless; because of you, the roses burn with vibrant red. — Emerson
人生最珍贵的财富，莫过于与他人建立的深厚友谊。——林肯
宁可与良善之人共食粗茶淡饭，也不愿与恶人同享盛宴珍馐。——托马斯·富勒
评判朋友真伪的标尺在于行动而非言语；那些口头承诺完美的人，往往离真正的友谊最远。——华盛顿
并非所有的亲属都能成为朋友，唯有建立在共同利益基础之上的人，方可称之为朋友。
建立在业务基础上的友谊，往往比建立在友谊基础上的业务更为稳固。——洛克菲勒
朋友，这便是我的肺腑之言：正因有了你的存在，天空才显得广阔无垠；正因有了你的陪伴，玫瑰才显得格外火红艳丽。——爱默生