必由之路 inevitable path
Explanation
指达到某个目标必须经历的道路或过程。比喻事情发展的必然规律或必须遵守的规则。
Refers to the road or process that must be experienced to achieve a certain goal. Figuratively: the inevitable law of the development of things or rules that must be followed.
Origin Story
话说唐僧师徒西天取经，经历九九八十一难，其中不少都是险象环生，困难重重。他们为了取得真经，必须经过这些磨难，这是他们取得真经的必由之路。一路上，他们克服了重重困难，战胜了妖魔鬼怪，最终取得了真经，修成正果。孙悟空的火眼金睛，唐僧的诚心向佛，八戒的憨厚老实，沙僧的默默无闻，这些都是他们取经路上不可或缺的品质，也让他们能够顺利地走过这段必由之路。他们的经历告诉我们，任何成功都不是轻而易举的，都需要付出努力和坚持，只有走过这条必由之路，才能最终到达成功的彼岸。
The story of Tang Sanzang and his disciples' journey to the West to obtain scriptures is full of dangers and difficulties. Many of them were life-threatening and fraught with difficulties. To obtain the scriptures, they had to go through these tribulations; this was the only way to obtain the scriptures. Along the way, they overcame many difficulties and defeated demons and monsters, ultimately obtaining the scriptures and achieving enlightenment. Sun Wukong's sharp eyes, Tang Sanzang's sincerity, Bajie's honesty, and Sha Seng's diligence were indispensable qualities on their journey, allowing them to successfully traverse this path. Their experience tells us that any success is not easy and requires effort and perseverance. Only by following this path can one finally reach the other shore of success.
Usage
常用来形容为达到某种目标必须经历的道路或过程，也比喻事物发展的必然规律或必须遵守的法则。
Often used to describe the path or process that must be followed to achieve a certain goal; figuratively, also used for the inevitable law of development of things or rules that must be followed.
Examples
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学习任何一门技术，都必须经过刻苦努力，这是必由之路。
xuéxí rènhé yī mén jìshù, dōu bìxū jīngguò kèkǔ nǔlì, zhè shì bìyóu zhī lù
To learn any technology, one must go through hard work; this is the only way.
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走向成功的道路上，可能会充满挑战，但只要坚持不懈，就能走过必由之路。
zǒuxiàng chénggōng de dàolù shàng, kěnéng huì chōngmǎn tiǎozhàn, dàn zhǐyào jiānchí bùxiè, jiù néng zǒuguò bìyóu zhī lù
On the road to success, there may be many challenges, but as long as you persevere, you can overcome any obstacle.
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人生的成长，也需要经历重重磨练，这条路是必由之路，任何人都无法回避。
rénshēng de chéngzhǎng, yě xūyào jīnglì chóngchóng mólìan, zhè tiáo lù shì bìyóu zhī lù, rènhé rén dōu wúfǎ huíbí
The growth of life also requires many trials and tribulations. This road is inevitable; no one can avoid it.