Leucite basalt was solidified by secondary magma, which was produced by fractional crystallization of a small amount ( 14%) of accumulative rock from primitive magma and assimilation of granite ( 28%). 白榴玄武岩为次生岩浆冷凝产物,是原生岩浆分离结晶约14%的橄榄石、辉石堆积岩,又同化混染了约28%的花岗岩所形成。
In a word, African Americans have reached a high level of cultural assimilation and are in the incipient stage of secondary structural assimilation. However, in the assimilation process they still face many challenges. 总的来说,非洲裔美国人在文化融合上已经达到较高的水平,而且已经处在次级结构融合的初级阶段。但是,在融入主流社会的进程中,非洲裔美国人仍然面临着诸多挑战。