preserver

/ˈlaɪf prɪˌzɝː.vɚ/

名词

救生圈或救生衣，救生背心（同 lifebelt 或 life jacket）
Before going out on the boat, make sure everyone has a preserver in case of an emergency.
在出海之前，请确保每个人都有一个救生衣，以防发生紧急情况。