Below is what most swimmers will find enables them to do what I did, which is going from 21 strokes per 20-yard length to 11 strokes in two workouts with no coach, no video monitoring.
下图是能让大多数泳者 也能做我所做到的， 那就是从每18米21次击水， 进步到11次击水， 只用两次练习，不用教练，不用录影。