待我长发及胸我就嫁给你
[dài wŏ zhăng fā jí xiōng wŏ jiù jià jĭ nĭ]
Translation of 'When My Long Hair Reaches Below My Chest, I Will Marry You', implies a promise or agreement between two lovers about getting married once a particular condition (in this case growing long hair) is met. Growing out one’s hair can take significant time, so it can symbolize waiting or anticipation until they're fully prepared or ready for matrimony.