他与楼下的房东发生了争执。He was in an argument with his landlord downstairs.她说他的朋友们可以在楼下的大房间里住一晚。She said his friends could sleep over in the big room downstairs.她重新粉刷了楼下的房间，并把二楼封上了。She repainted the downstairs rooms and closed off ...
媒染剂有助于将染料附着于材料.A modent mordant helps fix the dye to the material.有种称为媒染剂的方法常用于染色过程中.A solution called a mordant is used the dying process.传统上, 这种媒染剂在自然界中就能够找到.Traditionally, modernts mordants were found found in nature ...