willingly

He willingly shared his secret recipe with the students in the cooking class.

(Chinese) 他欣然在烹饪课上与学生们分享了他的秘密食谱。

Many volunteers willingly gave up their holiday to help clean the polluted beach.

(Chinese) 许多志愿者自愿放弃假期，帮助清理被污染的海滩。