如日方中 In its prime
Explanation
比喻事物正处于发展兴盛的阶段。
It is used to describe something that is at the peak of its development or success.
Origin Story
话说唐朝有个名叫李白的诗人，他年轻有为，才华横溢，诗作被世人传颂，他的名气如同太阳一般，正处于事业的巅峰时期，可谓是如日方中。他经常游历山水，在名胜古迹留下他潇洒不羁的诗篇，为后世留下了宝贵的文化财富。当时的唐朝经济繁荣昌盛，文化空前繁荣，正是盛世景象。李白在这样的时代背景下，诗歌创作达到了炉火纯青的境界，他与杜甫并称为诗仙诗圣，流芳百世。
It is said that in the Tang Dynasty, there was a poet named Li Bai. He was young and talented, his poems were praised by the world, and his fame was like the sun at its zenith, at the peak of his career. He often traveled through mountains and rivers, leaving his unrestrained poems at famous historical sites, leaving behind precious cultural heritage for posterity. The Tang Dynasty at that time was prosperous and its culture was unprecedentedly flourishing. In this context, Li Bai's poetry creation reached a state of perfection. He and Du Fu are known as the poetic immortal and sage, famous for generations.
Usage
主要用作谓语、定语，形容处于兴盛时期。
Mainly used as predicate and attributive, to describe something at the peak of its success.
Examples
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他正值如日方中的年纪，事业蒸蒸日上。
ta zheng zhi ru ri fang zhong de nianji, shiye zhengzheng shang shang.
He is at the height of his powers, his career is flourishing.
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改革开放以来，我国经济发展如日方中
gaige kaifang yilai, woguo jingji fazhan ru ri fang zhong
Since the opening and reform, China's economy has developed rapidly