救生员 in English:

He works as a lifeguard.

I applied for a job as a lifeguard at the community pool.

The lifeguard saw that a boy was in trouble in the pool and dived in to rescue him.

The lifeguard did everything he could to help that woman

The lifeguard patrolled the beach, making sure all the swimmers were safe.

He works as a lifeguard at the beach in the summer.

The lifeguard is ever ready to help others.