return to square one的用法和樣例：
例句
用作不及物動詞 (vi.)
- If the applied bending force is not sufficient to cause permanent plastic flow at either the inner or outer surfaces, the metal will return elastically to its original shape.
如果實際的彎曲力不足以在內表面或外表面引起永久的塑性流動，金屬會自動恢復到原來的形狀。 - Levels of epinephrine and norepinephrine increased significantly after the music therapy sessions but had returned to pretherapy levels 6 weeks after the sessions had been stopped.
腎上腺素和降腎上腺素也在音樂療程后大量增加，但在療程結束的六周后即恢復到原來的數量。
