初生之犊 newborn calf
Explanation
比喻年轻而缺乏经验的人，敢于冒险，无所畏惧。也指初入社会、事业的年轻人，勇敢无畏，充满活力。
A metaphor for young and inexperienced people who dare to take risks and are fearless. It also refers to young people who are entering society or their careers, brave and fearless, full of vitality.
Origin Story
话说东汉末年，战火纷飞，英雄辈出。关羽率领大军攻打襄阳，与曹军将领庞德展开激烈的对决。庞德勇猛无敌，屡屡杀败关羽的部下，关羽深感棘手。一日，关羽与众将商议对策，他看着地图上庞德军队驻扎的位置，沉吟片刻，说道："此庞德，乃初生之犊，其勇猛盖世，但其经验不足，易于轻敌。"
During the late Eastern Han Dynasty, when war and chaos ruled the land, many heroes emerged. Guan Yu led his army to attack Xiangyang, and fought fiercely against Cao Cao’s general Pang De. Pang De was invincible and repeatedly defeated Guan Yu's subordinates, causing Guan Yu great difficulty. One day, Guan Yu consulted with his generals about strategies. Looking at the map where Pang De's army was stationed, he pondered for a moment and said: "This Pang De is a newborn calf, his bravery is unparalleled, but his experience is insufficient, he is easy to underestimate the enemy."
Usage
常用于形容年轻人勇敢无畏、充满活力，也用于比喻初入某个领域的人，敢于挑战，不惧困难。
Often used to describe the courage and vitality of young people, and also used to describe people who are entering a new field, daring to challenge, not fearing difficulties.
Examples
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年轻人初生牛犊不怕虎，敢于挑战权威。
nián qīng rén chū shēng niú dú bù pà hǔ, gǎn yú tiǎo zhàn quán wēi.
Young people, like a calf just born, are not afraid of tigers. They dare to challenge authority.
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他初生牛犊般地闯入这个行业，凭借一股子冲劲儿很快站稳了脚跟。
tā chū shēng niú dú bān de chuàng rù zhège háng yè, píng jí yī gǔ zǐ chōng jìng ér hěn kuài zhàn wěn le jiǎo gēn.
He broke into this industry with the courage of a newborn calf, and quickly gained a foothold with his drive.
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面对困难，我们需要有初生牛犊不畏虎的精神。
miàn duì kùn nán, wǒ men xū yào yǒu chū shēng niú dú bù wèi hǔ de jīng shén。
In the face of difficulties, we need the spirit of a newborn calf who is not afraid of tigers.