cork purse ring 上括纲坏
A buoyant device, such as a cork or polystyrene ring, for keeping a person afloat in water.
救生圈,救生衣:一种有浮力的装置,如软木或聚苯乙烯圈,用来使人能浮在水中。
Picture an empty wine bottle with a cork secured at the top in the usual way. Inside the bottle a metal ring hangs suspended by a string.
设想一个空酒瓶,瓶口被软木塞以正常的方式塞住,瓶子里一个金属环悬挂在一根细绳上。
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