怡然自乐 contented and happy
Explanation
怡然：喜悦的样子。形容心情舒畅，自己感到快乐满足。
怡然: happy and contented appearance. Describes someone feeling happy and satisfied in their own state.
Origin Story
在古老的桃花源里，世外桃源的居民们日出而作，日落而息，过着宁静祥和的生活，他们与世隔绝，不问世事，脸上总是洋溢着幸福的笑容。孩子们在田间追逐嬉戏，大人们在田埂上谈笑风生，每家每户都充满了欢声笑语。他们日复一日，年复一年，怡然自乐地生活在世外桃源，感受着远离尘嚣的纯真与快乐，这便是世外桃源的真实写照，也是怡然自乐的最佳诠释。
In the ancient Peach Blossom Spring, the residents of this hidden paradise lived a peaceful and harmonious life. They rose with the sun and rested when it set. Isolated from the world, unconcerned with worldly affairs, their faces always beamed with happiness. Children chased and played in the fields, adults chatted and laughed on the paths, every household was filled with joyful laughter. Day after day, year after year, they lived contentedly in their hidden paradise, experiencing the purity and joy far from the hustle and bustle. This is the true picture of Peach Blossom Spring and the best interpretation of "怡然自乐".
Usage
形容人心情舒畅，自己感到快乐满足。多用于描写隐居生活或闲适情景。
Describes someone feeling happy and content, usually in the context of a secluded or leisurely lifestyle.
Examples
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他一个人住在深山里，过着怡然自乐的生活。
tā yīgèrén zhù zài shēnshān lǐ, guòzhe yí rán zì lè de shēnghuó.
He lives alone in the mountains, living a carefree and happy life.
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他怡然自乐地哼着小曲儿，全然不顾周围的喧嚣。
tā yí rán zì lè de hēngzhe xiǎo qū ér, quánrán bùgù zhōuwéi de xuānxiāo.
He hummed a little tune contentedly, ignoring the noise around him.