In contrast, we made a study of the distinction between language attrition and the phenomenon of "languages disappearance ", which including language transfer, aphasia and Alzheimer's dementia, language endangerment, and forgetting through the five attributes of generations relationship, occurrence mechanism, target groups, influencing factors and existence forms. We found though they are in the same category of "disappearance of languages", it appears a big difference between them by their nature. Meanwhile, we take a contrast for differences. Therefore, dividing "language disappear" into language macroscopic disappear and language microscopic disappear on further.

The phenomenon that language transfer turns into language attrition is seldom concerned by language researchers. From the perspective of theoretical comparison, the two are not the same in the carrier, influencing factors, intergenerational relations and existing form, which is one of the reasons for less attention. In a more than two-year follow-up survey of a subject who has lived in Korea for more than ten years, it is found that the word "Yushun" has successfully replaced the word "Yuxu" (word order) from the subject's mental lexicon, and repeated regression reminders have been made in the study, but the word "yuxu" still shows no sign of regression. To be sure, we can guess and even have reason to believe that if the subject return to their native language environment for a long time in the future, the word "Yuxu" can still regression to their mental lexicon. But unfortunately，in more than two years' follow-up survey, only one case of language transfer transformed into language attrition was found from a large number of corpus. In other words, it is not easy to capture the phenomenon that language transfer turns into language attrition.

Taking the language attitude of Chinese students in Seoul National University as the research goal, the paper makes a deep qualitative study. There are three stages in the study: in the first stage, 50 primary subjects are selected through a questionnaire survey. In the second stage, a multi-dimensional questionnaire survey of language attitude is conducted for several senior subjects. In the third stage, a qualitative interview survey is conducted for senior subjects, aiming to solve the unsolved and doubtful problems in the first two stages. Based on the findings of the three stages, this paper discusses whether language loyalty is equal to language maintenance, whether mother tongue anxiety will occurs, the language identity of multilingual and bilingual.

LARA is a website of summarizing language attrition research in the world. Its Chinese translation is called "Language Attrition Research Archive". It is divided into six parts: first language attrition, second language attrition, language relearning, symposia, other related subfields and researchers. Based on the authoritativeness of the research results on language attrition presented by this website, taking 1980 as a watershed, the research results before and after 1980 are classified and introduced. Since 1980, the study of language attrition has been welldeveloped, so the study of this stage has been classified and introduced in detail. In addition, this paper makes a brief comparison between language attrition Chinese research and international research from three aspects: the attributes of literature database, the number of documents, the depth and dimension of literature research.

Since the implementation of the Law of the People's Republic of China on General Languages and Characters, great changes have taken place in the language and character life of our country. The three evaluation systems involved in this law, Putonghua proficiency test, Chinese character application proficiency test and Chinese proficiency test, are gradually improving, but there are still many shortcomings. Among them, the Putonghua proficiency test system is relatively sound. Taking it as the blueprint, under the circumstances that the law, regulations, politics, economy, culture and academic background are fully allowed, the proposed construction of the Chinese character application proficiency test and Chinese proficiency test and other evaluation system will undoubtedly lead to a new step in language life, which is also a guarantee to improve the quality of language life for the whole people. In the construction of promotion and popularization, the evaluation system needs to focus on two questions: first, why to establish the evaluation system; second, how to establish the evaluation system. The construction of the new evaluation system will not only produce far-reaching academic significance, but also bring deep-seated economic benefits for socialist construction and development.

2008년 이래 시작된 미국의 서브프라임 모기지(비우량담보대출) 위기로 인한 글로벌 쓰나미는 전세계 가 80년대 중반 이래 고속 성장하던 상승세를 멈추고 2009년 마이너스 성장을 기록했다. 이번 위기에 대응하기 위해 각국은 위기로 인한 충격에 대응해 경기회복을 위한 조취를 취하고 있다. 본문의 연구는 한국과 일본에 초점을 맞췄다. 한국과 일본이 서브프라임 모기지 사태속에서 받은 영향을 분석해 양국의 경제정책을 비교 연구한 결과 아래와 같은 결론이 나왔다. 첫째, 2008년 미국 서브프라임 모기지의 근본원인 미국의 통화정책이 너무 느슨해 미국 금융시스템이 부실하고 특히 헤지펀드에 대한 감시가 없다는데 있다. 둘째, 한국은 1997년 아시아금융위기 당시 자국의 금융체제의 개혁 덕분에 2008년 서브프라임 모기지 사태 때 일본보다 국내 경제에 미치는 영향이 적었다. 셋째, 2008년 미국의 서브프라임 모기지 위기 대응 정책에서 일본의 경제 정책은 보다 세밀하고 구체적이지만, 심층적인 문제는 해결되지 않았다.