为加强研究生学术交流活动，推进学术创新，特开通“研究生学术报告预告区”。我校研究生和教师可以在预告区及时发布和了解有关研究生学术报告的信息，届时参加。也可就某学术报告展开专题讨论与交流。
In the report, I give an introduction to the linguistic study of second language acquisition, explaining what are the mechanisms in the study of second language acquisition. The report invovles two section, which are the internal focus and external focus.