难以为继 Unsustainable
Explanation
难以继续下去，无法维持。多用于表达某种状态、局面或事物发展到一定程度后，已无法继续保持下去。
Unable to continue, unable to maintain. Often used to express that a certain state, situation, or the development of something has reached a certain level and can no longer be maintained.
Origin Story
唐朝时期，一位名叫李白的诗人，创作才华横溢，诗作流传千古。他一生豪放不羁，常常纵情山水，醉酒赋诗。然而，这种生活方式却难以长久维持。随着年龄的增长，他的身体状况日渐衰弱，加之政治上的不得志，让他身心俱疲。尽管他依旧尝试保持着以往的豪迈，创作出不少佳作，但那种挥斥方遒的意气风发却渐渐消逝。他明白，这种纵情山水，醉酒作诗的生活方式，已经难以为继了。晚年的他，更加注重内心的平静，开始修身养性，他的诗作也逐渐从豪迈转向了沉静，虽少了些许激昂，却多了几分人生的感悟。
During the Tang Dynasty, a poet named Li Bai, whose creative talent was extraordinary, and whose poems have survived to this day, lived a life characterized by unconventionality and excess.He often sought nature, drank to excess, and wrote poetry. However, this lifestyle was hardly sustainable. As he aged, his physical condition weakened, and his lack of political success added to his exhaustion. Although he tried to maintain his earlier unconventionality and created numerous masterpieces, his earlier enthusiasm faded. He realized that his life of nature, alcohol, and poetry, could hardly be continued. In his later years, he placed more value on inner peace, cultivated himself and his poems shifted from unconventionality to tranquility, losing some passion but gaining more insight into life.
Usage
多用于比喻某种状态、形势或事物发展到一定程度后，已经无法继续下去。
Often used to describe a situation, state, or development that can no longer be continued after a certain point.
Examples
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公司面临资金链断裂，已经难以为继了。
gongsi mianlin zijinlian duanlie, yijing nanyi wei ji le.
The company is facing a funding chain rupture and can hardly continue.
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这种发展模式难以为继，必须进行改革。
zhezhong fazhan moshi nanyi wei ji,bixu jinxing gaige.
This development model is unsustainable and must be reformed.