姐妹不是谈谈而已姐妹不是说说而已
[jiĕ mèi bù shì tán tán ér yĭ jiĕ mèi bù shì shuō shuō ér yĭ]
'Sisters aren't just about talking'. This conveys the strong bond between friends who consider themselves sister-like. It emphasizes that their friendship is deep and not just superficial chat.