摩天轮也带不动的忧伤
[mó tiān lún yĕ dài bù dòng de yōu shāng]
The literal translation is 'the sorrow that even a Ferris wheel can't carry'. A Ferris wheel usually brings joy or excitement, and being unable to take away the sadness implies that one's sorrows are too profound and overwhelming, even for a symbol of happiness like a Ferris wheel.