There has been, in general, a mutual national cultural exchange. As China bestowed exquisite and practical silk fabric on the Western world, each country in Europe returned the favor. According to ancient documents, the walnut, cucumber, shallot, coriander, pepper, poplar fruit, carrot and many other plant species went to China from Western regions. (These things in China begin with the word 胡 [hu], which refers to something coming from the north and the west minority groups. Later, the word was widely used to represent something brought in from abroad.) The