It seems like both 为 and 是 mean "to be". In which cases is one used but not the other? Is it something like the difference between "estar" and "ser" in Spanish and Portuguese? (In the sense that one ...
Both 遇到 and 碰到 can be translated to "come across/run into" in those sentences: 遇到大学同学了。 碰到大学同学了。 What's the difference between 遇到 and 碰到?
衣服 and 衣饰 both mean "clothing"; but are they truly synonymous or is the use of each term confined to its own specific context? Or is it simply a difference between colloquial and formal speech or ...