凡取丝必用圆正独蚕茧,则绪不乱。若双茧并四五蚕共为茧,择去取绵用。或以为丝则粗甚。 3Wrs7yBzav7TYrp8h1x6MV58YdVxNyDAAm0Cw7b3dqU+bxwMolPtVGH5muocTIHU