Usage: The three words have similar meanings and are usually used to sigh that the changes of people or things around them are different from what they think. Among them, "something unexpected happens" is mostly used to miss old friends.
Expand information and change things.
Pronunciation: c ā ng h mi s ā ng ti á n
Meaning: Metaphorically, things have changed a lot.
Source: Jin's "Fairy Biography Magu": "Magu said the cloud; Self-waiter; I have seen that the East China Sea is a mulberry field. "
Example: Compared with the vicissitudes of everything in the world, a person's life is so short and insignificant.
Things have changed.
Pronunciation: shüShu biàn qiān
Meaning: Things in the world are constantly changing, which is very different from memory.
Ex.: I don't want to lament the changes in the world, nor do I want to wait for the unknown growth.
Things are still there, but people are not what they used to be.
Pronunciation: wüSHRén füI
Meaning: Things are still the original things, but people are not the original people. It is often used to express that things have changed. So I miss my old friend.
Source: Song Liqing according to "Wulingchun" words: "Things are not exhausted, tears flow first."
Example: Things have changed. This is the cruelest thing I have ever seen.