单词 | trapping layer |
例句 | DEFINITIVE EXAMPLES 权威例句To combat cold weather, birds ruffle their feathers, trapping layers of warm air to insulate their bodies.为了抵御寒冷天气,鸟儿们竖起羽毛,裹住一层层的暖气,使身体与外界隔绝。剑桥国际 |
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