学生飞行员和支持潜水员必须得到水中呼吸器认证书才能比赛。
Student pilots and support divers must become scuba certified in order to compete.
戴着呼吸器的潜水员潜入水底，朝珊瑚礁游了过去。
潜水员用自携式水下呼吸器把气球充满气，让它缓缓地把胳膊带到水面。
However huge the arm, it was fragile, and divers filled a balloon with air from a scuba mouthpiece to gently raise it to the surface.
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