时光招手我们已挥之而去
[shí guāng zhāo shŏu wŏ men yĭ huī zhī ér qù]
A nostalgic tone permeates this username which translates to the passage of time being so fast that when we wave hello to it (symbolic), we immediately had to wave goodbye indicating that opportunities or moments in life are fleeting and once gone cannot be held back or regained again.