漫无边际 boundless
Explanation
形容范围广阔，没有尽头。也指说话或写文章没有中心，东拉西扯。
Describes a vast, boundless expanse. Can also be applied to conversations or texts that lack a central theme.
Origin Story
很久以前，在一个遥远的山谷里，住着一个名叫小天的牧羊少年。每天，小天都会带着他心爱的羊群在广阔无垠的草原上放牧。草原上，绿草如茵，鲜花盛开，羊群在其中自由自在地吃草嬉戏。小天常常躺在柔软的草地上，仰望天空，看着那漫无边际的湛蓝，任由思绪飘向远方。他想象着草原的尽头是什么，是无边的海洋？还是连绵起伏的高山？也许，那里住着神奇的精灵，或者隐藏着不为人知的宝藏。每当夕阳西下，小天就会赶着羊群回家。夕阳染红了天空，也染红了草原，将一切笼罩在一片金色的光芒之中。小天看着远方，心中充满了对未来的憧憬和希望，他知道，他的生活将会像这片漫无边际的草原一样，充满无限的可能。
Long ago, in a remote valley, lived a shepherd boy named Xiaot. Every day, Xiaot would take his beloved flock to graze on the boundless prairie. On the prairie, the grass was as green as a carpet, and flowers bloomed everywhere. The flock grazed and frolicked freely. Xiaot would often lie on the soft grass, look up at the sky, and gaze at the endless blue, letting his thoughts drift far away. He imagined what was at the end of the prairie: a boundless ocean? Or rolling mountains? Perhaps, there lived magical spirits, or hidden treasures unknown to mankind. Every time the sun set, Xiaot would drive his flock home. The sunset dyed the sky red, and also dyed the prairie red, covering everything in a golden light. Xiaot looked into the distance, his heart filled with yearning and hope for the future. He knew that his life would be filled with endless possibilities, just like this boundless prairie.
Usage
常用来形容空间或范围的广阔，也用来比喻说话或写作没有中心，不着边际。
Often used to describe the vastness of space or scope, also used to describe a speech or writing that lacks a central theme and is irrelevant.
Examples
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草原一望无际，令人心旷神怡。
caoyuanyiwangwují, lingrenxinkuàngshényí
The prairie stretches endlessly, refreshing the mind.
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他的讲话漫无边际，让人难以捉摸重点。
ta de jiǎnghuà mànwúbiānji, ràngrénnányǐ zhuōmō zhòngdiǎn
His speech was rambling and it was difficult to grasp the key points.