In a sense, it's a debate that has been seesawing back and forth from crisis to crisis over the past century.
从某种意义上看，上个世纪的几个危机都是“你方唱罢，我就登场”的。
The score had been seesawing from the very start.
从一开始比分就成拉锯局面。
I like seesawing very much.
我非常喜欢玩跷跷板。
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