You'll need to master that first, otherwise your swimming will always be like the doggy-paddle. You'll splash water around a lot, with very little result.
首先你必须精通换气，否则你会游得像狗刨式一样，溅起许多水花却只得到一点效果。
3
And Marley does more than just doggypaddle, this golden retriever loves to dive and swim right to the bottom of this seven-foot pool.