Is the “butterfly” a swimming stroke or a tennis stroke?
a swimming stroke
A swimming stroke is a particular style or method of swimming. 游泳姿势
In sports such as tennis, baseball, golf, and cricket, a stroke is the action of hitting the ball. 击球
The history of butterfly stroke
The butterfly stroke wasn’t invented in a single, defining moment in our sport’s history. Rather, it was a handful of swimmers who were all attempting out-of-the-water recoveries while swimming breaststroke.
Officially, the International Swimming Hall of Fame recognizes Australian Sydney Cavill as the poppa of the stroke (with his father Fred being credited with being the original freestyler).
German Erich Rademacher was trying this weird new style of stroke in races in the late 1920’s, while Henry Myers, an American, raced in this haphazard new style at a race in 1933 at a YMCA in Brooklyn.