变化无常 changeable
Explanation
指事物经常变化，没有规律性。
Refers to the fact that things often change without regularity.
Origin Story
从前，在一个偏僻的小山村里，住着一位名叫阿牛的农夫。他勤劳善良，却总是被命运捉弄。他种的庄稼，一会儿被暴雨摧毁，一会儿又被干旱烤焦；他养的鸡鸭，一会儿被狐狸偷走，一会儿又被疾病侵害。阿牛的生活，就像这变化无常的天气一样，充满了不确定性和挑战。然而，阿牛并没有被命运打垮，他始终保持着乐观积极的心态，一次又一次地从挫折中爬起来，继续耕耘他的土地，守护他的家园。他坚信，只要坚持努力，总有一天会雨过天晴，收获属于自己的幸福。
Once upon a time, in a remote mountain village, lived a farmer named Aniu. He was diligent and kind, but always seemed to be at the mercy of fate. The crops he planted were sometimes destroyed by heavy rain, other times parched by drought; his chickens and ducks were sometimes stolen by foxes, sometimes ravaged by disease. Aniu's life, like the fickle weather, was full of uncertainty and challenge. However, Aniu wasn't defeated by fate; he always maintained an optimistic and positive attitude, getting up again and again from setbacks, continuing to cultivate his land, and protecting his home. He firmly believed that as long as he persisted in his efforts, one day the clouds would part, and he would reap his own happiness.
Usage
用于形容事物变化多端，没有规律。
Used to describe things that change frequently and unpredictably.
Examples
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这几天天气变化无常，一会儿阳光明媚，一会儿又狂风暴雨。
zhè jǐ tiān tiānqì biànhuà wúcháng, yīhuǐ'er yángguāng míngmèi, yīhuǐ'er yòu kuángfēng bàoyǔ.
The weather has been very changeable these days; one moment it's sunny, the next it's a storm.
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股市变化无常，风险极高。
gǔshì biànhuà wúcháng, fēngxiǎn jí gāo
The stock market is highly volatile and very risky.