游泳教练员、救生员队伍不稳定性、不专业性，且培训体制不太完善。
Swim instructors, lifeguards contingent of instability, not professional, and the training system, not perfect.
他的游泳专业职责包括自1975年起，为全美游泳教练员协会监事会提供服务。
His swimming-related duties include serving on the American swimming Coaches Association (ASCA) Board of Directors since 1975.
基于动量的游泳运动员，教练员和运动员的距离，都应该能够更好的确定他们的“标志”应该更近，或者更远，比原套的距离。
Based on the momentum of the swimmers, and the distance, both coaches and swimmers should be able to better determine if their "mark" should be closer, or farther, than the original set distance.
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