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。 VKTH93m8g2Qh9N+r0MHHrQ/h6RDlX3GAchRMffOm+v945jMh5IaHMv+KaH4V3ay0