Definition: something you wear that is like a jacket with no sleeves Level: C2
我祖父总是把他的背心扣好。
My grandfather always wore his ___vest buttoned up.
确保船上每个人都有救生背心。
Be sure you have a life ___vest for each person in the boat.
毛衣背心是在凉爽天气叠穿的完美选择。
A sweater ___vest is perfect for layering in cool weather.
