Ft Distance travelled by swimming

• 游泳距离

Ft Distance travelled by swimming的用法和样例：

例句

1. Can you keep swimming when you get a side stitch, calf cramp, or foot cramp?Can you swim underwater for a few seconds without feeling claustrophobic?
   那么，在没有安全保障的情况下，多长的游泳距离是你感觉安然无事的呢？