儿童们正在陈经纶体育学校体育馆内参加游泳训练，中国杭州

water swimming pool beach reef swimming pool ocean nature aqua blue outdoor sea turquoise shore azure water sport aerial marine mammal animal whale fish sea lion common bottlenose dolphin bottlenose dolphin fin wholphin aquatic mammal cartilaginous fish underwater cetacea harbor seal aquarium common dolphins killer whale shark dolphin sky landscape scene cloud city building lake island wave palm tree tree cake mollusk decorated