seesaw between A and B
两端多为对立的状态、数字或立场，表示在两者之间来回变动。
Public opinion seesawed between the two candidates.
公众舆论在两位候选人之间摇摆不定。
玩跷跷板；坐跷跷板；使来回摆动；使上下晃动；玩跷跷板。；波动；起伏。；使像跷跷板似的来回移动。
to fluctuate or change repeatedly up and down
玩跷跷板。
To use a seesaw.
波动；起伏。
To fluctuate.
使像跷跷板似的来回移动。
To cause to move backward and forward in a seesaw fashion.
一般现在时
The stock price seesaws wildly every week.
股价每周剧烈起伏。
一般过去时
The little boat seesawed on the waves.
小船在浪中上下颠簸。
present progressive
The children are seesawing in the park.
孩子们正在公园里玩跷跷板。
规则动词，第三人称单数为 seesaws，现在分词为 seesawing，过去式和过去分词均为 seesawed。
Vegetable prices seesaw from one week to the next.
蔬菜价格一周一周地上下波动。
用法提示：seesaw 作动词，用一般现在时说明价格反复上下波动。
Her mood seesawed between hope and worry all afternoon.
整个下午她的情绪都在希望与担忧之间起起伏伏。
用法提示：seesaw 的过去式 seesawed，表示情绪在过去一段时间里来回起伏。
The team's sales have been seesawing between gains and losses since spring.
从春天以来，这支队伍的销售业绩一直在盈利与亏损之间来回波动。
用法提示：seesaw 的现在分词 seesawing 与 have been 连用，表示一段时间内持续交替涨跌。
两端多为对立的状态、数字或立场，表示在两者之间来回变动。
Public opinion seesawed between the two candidates.
公众舆论在两位候选人之间摇摆不定。
此义为及物用法，宾语通常是被人为来回移动的具体物体。
He seesawed the lever back and forth.
他让操纵杆来回摆动。
此义指实际玩跷跷板，常接地点状语。
The children were seesawing happily in the playground.
孩子们在操场上高兴地玩跷跷板。
grammar · medium
易错句子The exchange rate seesawed between 6.8 to 7.0 yuan.
正确表达The exchange rate seesawed between 6.8 and 7.0 yuan.
seesaw 表示“在两个数值之间来回波动”时与 between 搭配，而 between 必须用 and 连接两个端点，不能用 to。汉语说“在6.8到7.0之间”，把“到”直译成 to 就错了；改成 and 才符合 between...and... 的固定搭配。
grammar · medium
易错句子The children like to play seesaw after school.
正确表达The children like to play on a seesaw after school.
汉语“玩跷跷板”是动宾结构，直译成 play seesaw 会漏掉介词和冠词。英语中跷跷板是可数名词，需说 play on a seesaw（介词 on + 冠词 a）；也可直接用动词 seesaw，如 The children seesawed after school.
在…之间来回波动
Her emotions seesawed between joy and despair.
她的情绪在喜悦和绝望之间来回波动。
来回摇摆；反复不定
The debate seesawed back and forth for hours.
辩论来回反复了好几个小时。
剧烈波动
The share price seesawed wildly during the day.
股价在当天剧烈波动。
上下起伏
Oil prices seesawed up and down all month.
油价整个月都在上下起伏。
从一个极端波动到另一个极端
His moods seesawed from one extreme to another.
他的情绪从一个极端波动到另一个极端。
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