举办过最多次数世博会的国家是美国。
USA is the country that hosts World Expo for the most times.
每一次恢复到初始位置计算为一次俯卧撑，尽最大可能进行最多次数的俯卧撑，直到你需要休息为止。
Count each time you return to the starting position as one push-up. Do as many push-ups as you can until you need to stop for rest.
低龄运动员水平——25米池训练，尝试着在每次的25米潜游中增加踢腿的次数，在之后的训练中尽量保持最多次数的踢腿。
Age Group Level - sets of 25s, increasing the number of kicks underwater on each 25; holding the determined number of kicks underwater off each wall in training sets.
低龄运动员水平——25米池训练，尝试着在每次的25米潜游中增加踢腿的次数，在之后的训练中尽量保持最多次数的踢腿。
Age Group Level - sets of 25s, increasing the number of kicks underwater on each 25; holding the determined number of kicks underwater off each wall in training sets.
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