down feather

例句：

1. 1. The bird's down feathers are soft andwarm.
   这只鸟的羽毛柔软而温暖。
2. 2.The down feathers on the pillow aresoft and comfortable.
   枕头上的羽绒软而舒适。
3. 3. The down feathers on thecoat are insulating and keep thewearer warm.
   这件外套上的羽绒保暖且隔热。