1 B1 习语 中性
偶然发现或遇到某事物或某人,并不是特意去找。
"While hiking in the hills, we happened upon the ruins of an ancient church."
“
I happened upon a copy of Orwell's 'Down and Out in Paris and London' in a second-hand bookshop.
— Commonly cited type of anecdote in literary memoir writing; representative of established idiomatic usage
不可分离