芭蕾舞演员在练习时不停地旋转，展示完美的单脚旋转技巧。

The ballet dancer kept ___pirouetting during practice, demonstrating perfect one-foot spins.

芭蕾舞演员在舞台中央优雅地完成了三个单足旋转。

The ballet dancer performed three graceful ___pirouettes at center stage.