A swimming stroke in which a person lies face down in the water and extends the arms in front of the head, then sweeps them both back laterally under the surface of the water while performing a frog kick.是什么意思_A swimming stroke in which a person lies face down in the water and extends the arms in front of the head, then sweeps them both back laterally under the surface of the water while performing a frog kick.在线翻译_英语_读音_用法_例句