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。 DcZe+rPwLrft6ByCRdmea3S36RS1+Y4o1hJX6Cadk3rckSsBVBjLa/FG6SXeeaMI