她仅是我的蓝颜而已
[tā jĭn shì wŏ de lán yán ér yĭ]
'She is Just My Male Best Friend' means that she only occupies the role of best friend status in the speaker's social circle rather than a potential love interest, using 'blue face' originally referred in classical literature and opera context, now colloquial for male platonic friendships in Chinese.