backstroke
noun [ S or U ] uk/ˈbæk.strəʊk/ us/ˈbæk.stroʊk/
仰泳
a way of swimming in which you lie on your back and move one arm and then the other straight behind you so that they pass the sides of your head, while kicking with your legs
Can you do backstroke? 你会仰泳吗？