key industries; major industries
Refers to industries that are central to a country's or region's economy, such as manufacturing, energy, or technology.
The automobile industry is one of Japan's key industries.
基幹産業 emphasizes foundational or core industries that support the entire economy, while 主要工業 is a broader term for important industrial sectors.
Compound of 主要 (main, principal) and 工業 (industry).