Definition: If something is second-hand, someone else owned or used it before you. Level: B1
为了省钱，我经常买二手书。
I often buy ___second-hand books to save money.
这些独特的外套是在一家二手店里找到的。
These unique jackets were found in a ___second-hand store.
他去年买了一辆二手车。
He bought a ___second-hand car last year.
