In the quilt familial in, eider down is the costliest, eider down by warmth retention property is beyond question, still have eider down by weight is the lightest.

• 在被子的家族里，羽绒被算是最昂贵的了，羽绒被的保暖性毋庸置疑，还有羽绒被的重量最轻。