noun 下载 🔗分享 救生衣,漂浮背心。 An article of protective clothing that is designed to keep the wearer's head floating above the surface of the water. Examples : "The boat trip required everyone to wear lifejackets for safety. " 为了安全起见,乘船游览要求每个人都穿上救生衣。 nautical sailing aid wear device 与AI对话词汇游戏阅读练习