<p>➀ The development history of semiconductor materials, from the first generation to the third generation;</p><p>➁ The unique physical properties of silicon carbide (SiC) and gallium nitride (GaN), such as wide bandgap, high breakdown field, high electron mobility, and excellent thermal conductivity;</p><p>➂ The market landscape of SiC and GaN, including market size, key players, and application areas.</p>