·2,447,543篇论文数据，部分数据来源于NoteExpress
Another possibility to check approximately the feather and down proofness is to measure the air permeability of the fabric.
另外可能近似测试出羽毛羽绒不穿透性的方法是：测量面料的空气渗透性。
youdao
应用推荐
模块上移
模块下移
不移动