致力于 (zhìlìyú) means 'to be dedicated to' a goal or cause, focusing on sustained effort toward a purpose. It is more formal than 贡献 (gòngxiàn 'to contribute'), which emphasizes giving something (time, resources) to a collective effort; 奉献 (fèngxiàn) is even more elevated, implying selfless devotion to a noble cause. 专用 (zhuānyòng) means 'dedicated to exclusive use' (e.g., a device or lane), not personal commitment.