A wreath is an arrangement of flowers and leaves in the shape of a circle, which you put on a grave or by a statue to show that you remember a died person. 花圈
noun [专属名词]花环,花冠,花圈;环状物,圈状物;(烟、云等的)环,圈;(纹章)饰环
The Queen laid a wreath at the war memorial. 女王向阵亡将士纪念碑献了花圈。