如火如荼 like fire and like hemp flowers
Explanation
形容气势旺盛，气氛热烈。多用于形容大规模的行动或事业蓬勃发展。
describes a lively and dynamic atmosphere; often used to describe a large-scale action or a thriving undertaking.
Origin Story
春秋时期，吴国军队势如破竹，攻城略地，扩张领土。一次大战役中，吴王夫差率领大军与强大的越国作战。大战开始前，吴国军队列阵完毕，只见红旗招展，士兵个个身披鲜艳盔甲，队伍整齐划一，气势逼人。从远处望去，如同熊熊烈火一般，又如一片雪白的荼花，场面极其壮观。吴军将士士气高涨，斗志昂扬，最终以少胜多，取得了辉煌的胜利。这场战争充分展现了吴国军队的强大实力和如火如荼的战斗气势。此后，“如火如荼”便成为人们形容大规模行动气势旺盛，气氛热烈常用的成语。
During the Spring and Autumn period, the Wu army was unstoppable, conquering cities and expanding its territory. In a major battle, King Fuchai of Wu led his army against the powerful Yue state. Before the battle began, the Wu army formed its ranks, and red flags waved everywhere, soldiers wearing bright armor, the ranks neat and uniform, and their fighting spirit was impressive. From a distance, it looked like a raging fire, and again like a field of white flowers, a spectacular scene. The morale of Wu's soldiers was high, their fighting spirit soaring, and ultimately they won a glorious victory against the odds. This war fully demonstrated the Wu army's strength and its fiery fighting spirit. After this, “ru huo ru tu” has become a commonly used idiom to describe the vigorous momentum and passionate atmosphere of large-scale actions.
Usage
多用于形容大规模的行动或事业蓬勃发展，气势旺盛，气氛热烈。
It's often used to describe a large-scale action or a thriving undertaking marked by great momentum and intense atmosphere.
Examples
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改革开放以来，我国经济发展如火如荼。
gǎigé kāifàng yǐlái, wǒguó jīngjì fāzhǎn rú huǒ rú tú
Since the reform and opening up, China's economic development has been in full swing.
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学习贯彻党的二十大精神的热潮如火如荼。
xuéxí guànchè dàngxí èrshí dà jīngshen de rècháo rú huǒ rú tú
The wave of studying and implementing the spirit of the 20th National Congress of the Communist Party of China is in full swing.