I've started to learn English language since entering middle school. I have constant contact with English language due to my scholarly needs throughout high school, undergraduate school, graduate school and research. Nevetheless, I still sometimes have difficulty telling the shade of closely related words. In addition, though I can generally understand a sentence by roughly analyzing its grammatical structure, I don't know the detail of syntax. Therefore I particularly hope to improve the two aspects. I often need to use English in scientific communication and hope to reinforce my English in this context.