noun 下载 🔗分享 救生衣,浮力背心 A waterproof device in the form of a jacket, which stops one from sinking in water. Examples : "The lifeguard instructed all children near the lake to wear buoyancy aids. " 救生员要求所有在湖边玩耍的孩子都穿上救生衣/浮力背心。 nautical device sailing aid 与AI对话词汇游戏阅读练习