Twilight Sihe means that the dark sky in the evening is shrouded from all sides.
The original sentence should be "The twilight is all around, and the lanterns are coming on." It means: In the evening, when the sky gradually darkens, colorful lanterns are hung on the streets, which is gorgeous. The lanterns have just come on: an idiom, which means that the beautiful and bright lamps have just been lit up. It is generally used to describe the city scene when night falls.
Twilight, a Chinese word whose pinyin is mùsè, means the sky at dusk. Sihe, in ancient Chinese, the pinyin is sìhé. It means "surrounded from all sides" and "coordinated from all sides". Also used as place names and song brand names.