expansion/ɪkˈspænʃn; ɪks`pænʃən/ n[U]action of expanding; state of being expanded 扩大; 扩展; 膨胀 the expansion of gases when heated 气体受热时的膨胀 the expansion of his business interests 他的商业利益的增加 the expansion of the school system 学校机构的扩大.
牛津英汉双解词典