circular lifebelt救生圈
a lifebelt一个救生圈
Lifebelt by the sea经过大海安全带图片
Lifebelt near the coast近海岸安全带图片
N-COUNT（可数名词） A lifebelt is a large ring, usually made of a light substance such as cork, which someone who has fallen into deep water can use to float. 救生圈 [英国英语]