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see.sawH5si:7sC:, $-sB:n [C]Am also tee.ter-tot.ter a board balanced on a central point. A child sits on each end and they make the board go up and down by pushing off the ground with their feet.跷跷板Prices have gone up and down like a seesaw this year.今 年的价格像跷跷板一样时涨时跌。
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