"Look at your growth rings" is a lyric in the song "Take You on a Travel", which is generally used to describe a sweet trip between couples.

"Take You to Travel" is a song written, composed and arranged by Zhu He and Baozi***, and sung by Zhu He. It was released on July 24, 2017. This song is also Zhu He's single released on Kugou Music. Baozi is a fan of Zhu He. Baozi's parents hope that she can be with Zhu He, so they say this to Zhu He: "Come to Qinghai Lake when you have time and look at the annual rings of Qinghai Lake." Later, Zhu He and Baozi heard a French folk song "Verte Rive" on the Internet. The melody fit the story of Zhu He and Baozi, so they wrote the lyrics and composed "Take You on a Travel".

Therefore, "Look at your growth rings" is a lyric in the song "Take You on a Travel", which is generally used to describe a sweet trip between lovers.