The Lonely Journey was a classic science fiction novel written by Liu Cixin. Here are some examples of appreciative sentences: In this universe, all forms of life are lonely, looking for their own home. They shut themselves up from the outside world and only communicate with their own hearts. Solitude is a powerful force that can make people more tenacious and wiser. In this era full of war and destruction, loneliness was a luxury. Their hearts are broken and cannot be healed. These sentences express the power of loneliness and the meaning of life by describing the loneliness and predicament experienced by the protagonist in the lonely journey. At the same time, the sentence also reflected the background of the era and society, expressing the impact of loneliness on life.