A part of a bigger system that has its own specific job to do.
The car's cooling subsystem helps keep the engine from overheating.
車の冷却サブシステムはエンジンの過熱を防ぐのに役立ちます。
A set of parts working together inside a larger system to do something important.
The immune subsystem fights off germs to keep us healthy.
免疫サブシステムは私たちを健康に保つために細菌と戦います。