see·saw /ˈsiˌsɔ/
 蹺蹺板,上下動(a.)前後動的,交互的(vi.)玩蹺蹺板,上下搖動


 see-saw
 蹺板


 See·saw n.
 1. A play among children in which they are seated upon the opposite ends of a plank which is balanced in the middle, and move alternately up and down.
 2. A plank or board adjusted for this play.
 3. A vibratory or reciprocating motion.
    He has been arguing in a circle; there is thus a seesaw between the hypothesis and fact.   --Sir W. Hamilton.
 4. Whist. Same as Crossruff.


 See·saw, v. i. [imp. & p. p. Seesawad p. pr. & vb. n. Seesawing.] To move with a reciprocating motion; to move backward and forward, or upward and downward.


 See·saw, v. t. To cause to move backward and forward in seesaw fashion.
    He seesaws himself to and fro.   --Ld. Lytton.


 See·saw, a. Moving up and down, or to and fro; having a reciprocating motion.

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 seesaw
      n : a plaything consisting of a board balanced on a fulcrum; the
          board is ridden up and down by children at either end
          [syn: teeter-totter, teeterboard, tilting board, {dandle
          board]
      v 1: ride on a plank
      2: move up and down as if on a seesaw
      3: move unsteadily, with a rocking motion [syn: teeter, totter]