Children swim at the pool, under the watchful eye of lifeguards.孩子们在救生员的监护下在水池里游泳。The lifeguards must be trained to deal with any sort of emergency.救生员一定要接受训练,学会应付各种紧急情况.Most of the cases occur at beaches without lifegua...

lifeguards的音标：...

n.救生员( lifeguard的名词复数 )...