密不透风的城市街道不曾在它的任何角落留下透气的机会。
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。
Good air permeability, colour and lustre is natural, pure and fresh and soft beauty, color pattern, modelling fluent graceful.透气性好,色泽自然,花型秀丽,颜色清新柔和,造型流畅优美。