Yongxu Chen

Abstract Background: Primary malignant melanoma of the bladder (PMMB) represents an extraordinarily rare diagnostic entity among bladder malignancies, with fewer than 50 well-documented cases reported in modern medical literature. Due to its rarity, standardized treatment protocols remain undefined, and prognostic outcomes are poorly characterized.

Conflicts of interest statement The authors declare that there is no conflict of interest regarding the publication of this paper. References , , et al. (2018) Geological and climatic influences on mountain biodiversity. Nature Geoscience 11: 718–725. , , (2018) Sustainability choice of different hybrid timber structure for low medium cost single-story residential building: Environmental, economic and social assessment. Journal of Building Engineering 20: 235–247.

1. Introduction With the progress of human society, the depleted stocks of fossil energy cannot meet the increasing energy requirement. Moreover, the applications of fossil energy have resulted in a series of environmental deterioration issues, including air pollution and the greenhouse effect [,,]. Therefore, the development and utilization of clean energy, such as solar, biomass, hydrogen, wind, water, and nuclear energy, will help alleviate the present energy crisis.