✔ 最佳答案
I think this research not bad, because know two language must superior than know one language, because we the most basic need to know two language, If go to society work, shopkeeper must invite who know two language of people more than know one language, such as tourist guide of work, must need to know many language so that can communicate with visitor, otherwise ( 有另外的意思。) know two language not only can communicate with foreigner, even more superior than other people.