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Seesaw
A seesaw (also known as a teeter-totter or teeterboard) is a long, narrow board supported by a single pivot point, most commonly located at the midpoint between both "ends"; as one end goes up, the other goes down. ==Mechanics== Mechanically, a seesaw is a lever and fulcrum.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Seesaw」の詳細全文を読む
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