这本书是有关于地磁的.This book is about the earth's magnetism.他们发现, 牛在吃草或是休息的时候, 总是面向地磁的南极或是北极.And, when grazing or resting, cows tended to face either magnetic north or south....
羊驼毛这种哺乳动物丝一般的毛.The silky wool of this mammal.摘要从产品的时尚及实用需求出发,开发生产了化学纤维仿羊驼毛织物用纱.An imitated chemical fiber alpaca yarn was developed to keep up with vogue and meet practicality.从产品的时尚及实用需求出发,开发生产了化学纤维仿羊驼毛织物用纱.An imitated ...