王仲翔：2004美国麻省理工学院天体物理博士，先后在美国麻省理工学院空间科学中心和加拿大麦吉尔大学物理系从事博士后研究。2009年加入中科院上海天文台，任研究员。2020年至今，云南大学物理与天文学院研究员。主要从事高能天体物理相关研究，至今在包括自然、自然通讯等天体物理杂志上发表论文约80篇。  With its unprecedented spatial resolution and sensitivity, Fermi Gamma-ray Space Telescope has revolutionized our view of gamma-ray sky. Not only have the populations of high-energy objects in our Galaxy and the universe been established, but also many interesting phenomena and related physical processes have been revealed. In this talk, I will present two intriguing cases we have recently worked on using Fermi’s gamma-ray observations. In case 1, I will show detection of a narrow line-like feature found in the gamma-ray spectrum of a blazar, for which we provide an interpretation requiring the existence of Axion-like particles (ALPs; candidate dark mater particles). In case 2, I will show a gamma-ray enhancement event found in a young supernova remnant (SNR). The event suggests acceleration of particles upto 10~PeV in young SNRs and likely reveals the more complicated side of young SNRs.