This primitive form of vegeculture (cultivation of root and tree crops) may have been the economic tradition onto which the cultivation of summer rainfall cereal crops was grafte...
because of后面通常是接名词或代词。如:He is here because of you. 他为你而来这里。He was late because of the snow. 由于下崐雪,他迟到了。I can’t buy it because of my lack of money. 我不能买它是因为没钱...