感慨万端 full of emotion
Explanation
感慨万端是一个成语，意思是因深有感触而有许多慨叹。它通常用来形容一个人内心充满多种复杂的感受，比如喜悦、悲伤、怀念、遗憾等等。
Gǎnkǎi wàn duān is an idiom that means to have many feelings and thoughts due to deep emotion. It's often used to describe a person's complex feelings, such as joy, sadness, longing, regret, etc.
Origin Story
老张今年60岁了，退休后回到阔别已久的家乡。看着家乡日新月异的变化，他感慨万端。儿时的伙伴大多已不在人世，记忆中那些熟悉的景象也已经消失殆尽，取而代之的是高楼大厦和川流不息的车辆。他既为家乡的繁荣感到欣慰，又为逝去的岁月感到惋惜。他坐在村头的老树下，看着夕阳西下，思绪万千，心中百感交集。他仿佛回到了童年，回到了那个充满欢声笑语的年代，又仿佛看到了未来，看到了家乡更加美好的明天。
Old Zhang is 60 years old this year, and after retirement, he returned to his hometown which he had not seen for a long time. Looking at the tremendous changes of his hometown, he was full of emotion. Most of his childhood friends were no longer alive, and the familiar scenes in his memory had disappeared, replaced by high-rise buildings and endless traffic. He was relieved by the prosperity of his hometown, but also regretted the passing years. Sitting under the old tree at the head of the village, he watched the sunset, lost in thought, his heart full of complex feelings. He seemed to be back in his childhood, back in the days full of laughter and joy, and he also saw the future, the brighter future of his hometown.
Usage
感慨万端通常用作谓语，表示内心感慨良多。
Gǎnkǎi wàn duān is usually used as a predicate, indicating that one has many feelings in the heart.
Examples
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他经历了这么多事情，真是感慨万端。
ta jinglile zheme duo shiqing,zhen shi gankai wanduan.
He has experienced so many things, he is full of emotion.
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看着家乡的变化，他感慨万端。
kanzhe jiangxiang de bianhua,ta gankai wanduan.
Looking at the changes in his hometown, he is full of emotion.