natation

这位生物学家研究了海豚惊人的游泳能力。

The biologist studied the dolphin's remarkable ___natation.

在古代文献中，游泳被视为一项关键的军事技能。

In ancient texts, ___natation was considered a crucial military skill.

她的游泳术在平静的湖面上展现得优雅而高效。

Her ___natation was graceful and efficient across the calm lake.