忠诚 (zhōng chéng): ทุ่มเท

This guide dog is very loyal to its owner; no matter where the owner goes, it will follow closely.

He worked at the company for twenty years, always loyal to his duties, and never did anything to harm the company's interests.

A true friend will still loyally stand by your side when you are in trouble, rather than choosing to leave.

When they got married, they promised to be loyal to each other, supporting one another in sickness and in health.