on a seesaw
指游乐场的跷跷板，是可数名词，复数形式为 seesaws。
The two children sat on a seesaw and took turns going up and down.
两个孩子坐在跷跷板上，轮流一上一下。
上下摆动；起伏；交替变化；胸腹矛盾呼吸；反常呼吸；风车战术；跷跷板战术；一种游戏器材,由一块中间平衡支撑的木板构成,一人上升时另一人下降。；一系列上下运动。
A long board balanced on a central support, used as playground equipment; one end goes up while the other goes down.
一种游戏器材,由一块中间平衡支撑的木板构成,一人上升时另一人下降。
A structure composed of a plank, balanced in the middle, used as a game in which one person goes up as the other goes down.
一系列上下运动。
A series of up-and-down movements.
一系列交替的运动或情感。
A series of alternating movements or feelings.
由气道阻塞引起的异常呼吸模式,表现为胸腹矛盾运动。
An abnormal breathing pattern caused by airway obstruction, characterized by paradoxical chest and abdominal movement.
一种战术:一方反复获取子力,同时制造一系列无法逃避的交替直接将军与闪将。
A tactic in which a piece repeatedly gains material, while simultaneously creating an inescapable series of alternating direct and discovered checks.
The children took turns on the seesaw in the park.
孩子们在公园里轮流玩跷跷板。
用法提示：seesaw 在这里是名词，指公园里那种中间有支点、两人轮流升降的游戏器材。
She sat on one end of the seesaw and waited for her friend to sit on the other.
她坐在跷跷板的一端，等朋友坐到另一端。
用法提示：seesaw 作名词，指一块中间平衡支撑的木板，也就是跷跷板。
The seesaw went up and down as the two boys pushed off the ground.
两个男孩蹬地时，跷跷板上下起伏。
用法提示：seesaw 是名词，指两人一上一下运动的跷跷板。
指游乐场的跷跷板，是可数名词，复数形式为 seesaws。
The two children sat on a seesaw and took turns going up and down.
两个孩子坐在跷跷板上，轮流一上一下。
用于描述情绪、局势等来回交替变化，of 后接变化的名词。
The seesaw of emotions during the crisis left her exhausted.
危机期间情绪的起伏让她疲惫不堪。
强调在两者之间来回摆动，A 和 B 常为对立的事物。
The seesaw between hope and despair marked the whole year.
希望与绝望之间的交替贯穿了整整一年。
grammar · medium
易错句子We bought seesaw for the garden.
正确表达We bought a seesaw for the garden.
seesaw 是可数名词，单数形式前面必须有冠词 a/an 或 the；中文说“买了跷跷板”时名词前不带冠词，直译过来就会漏掉 a。表示“一个跷跷板”要说 a seesaw。
grammar · medium
易错句子The kids like to play the seesaw after school.
正确表达The kids like to play on the seesaw after school.
中文“玩跷跷板”是“动词+宾语”，但英语里 play 后面接游乐设施名词时要加介词 on（play on the seesaw／play on the swings），直接说 play the seesaw 是把中文结构照搬了过来。
玩跷跷板
The children took turns playing on the seesaw in the park.
孩子们在公园里轮流玩跷跷板。
一场拉锯战
The two teams fought a seesaw battle until the final minute.
两队一直鏖战到最后一分钟,打了一场拉锯战。
情绪的反复起伏
She rode the seesaw of emotions from hope to despair and back again.
她经历着情绪的反复起伏,从满怀希望到绝望,又回到希望。
起伏交替的模式
Rainfall in the region follows a seesaw pattern from year to year.
该地区的降雨量年复一年呈现出起伏交替的模式。
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