"Life is constantly changing" 是一个常见的表达，用来描述生活中事物总是在变化。这个表达可以用来描述生活中的各种变化，包括人们的感情、关系、工作、生活方式等等。

举个例子，可以这样说:

"It's hard to keep up with everything that's changing in the world right now." (这个世界上现在发生的事情太多，很难跟上)
"I've learned that you can't take anything for granted in pfe, because it's always changing." (我学到了，在生活中不能把任何事情视为理所当然，因为一切都在不断变化)

这个表达来源于英语中的一个常用词组 "constantly changing"，"constantly" 意思是"不断地"，"changing" 意思是"改变"。"Constantly changing" 的意思就是"不断地改变"，可以用来描述生活中的各种变化。

例句:

"The weather is constantly changing, so it's hard to know what to wear." (天气不断地变化，所以很难知道该穿什么)
"The job market is constantly changing, so it's important to stay up to date with the latest skills and trends." (就业市场不断地变化，所以保持最新的技能和趋势是很重要的)