这条羽绒被填充了优质鸭绒，既轻盈又格外保暖。

The duvet is stuffed with premium ___eiderdown, making it lightweight yet exceptionally warm.

她买了一条新的鸭绒被来抵御寒冷的冬夜。

She bought a new ___eiderdown to keep warm during the cold winter nights.