English Dictionary

personal flotation device

noun

A life vest or other device or article of clothing designed to be used by one person as an aid to remaining safely afloat in water, especially in a emergency situation.

Make sure to wear a personal flotation device when you go boating.

意味（1）

A life vest or other device or article of clothing designed to be used by one person as an aid to remaining safely afloat in water, especially in a emergency situation.

Under the new personal flotation device regulations, boats 16 feet and longer must have one wearable type flotation device on board the boat for each person.