1. 跷跷板：teeter 步履蹒跚 | teeterboard 跷跷板 | teetertotter 跷跷板

2. 大跳板：22、溜冰;RollerSkating | 23、魔术古钟;MagicClock | 24、大跳板;TeeterBoard

noun

1. a plaything consisting of a board balanced on a fulcrum
    the board is ridden up and down by children at either end

    Synonym: seesawteeterteeter-totterteetertottertilting boarddandle board