see-saw
柯林斯词典
1. N-COUNT A seesaw is a long board which is balanced in the middle. To play on it, a child sits on each end, and when one end goes up, the other goes down. 蹺蹺板
There was a sandpit, a seesaw and a swing in the playground. 操場上有一個沙坑,一副蹺蹺板和一架鞦千。
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