===== B2 Vocabulary Checklist =====
**What it is:** Vocabulary for arguments, formal writing, and professional topics.  
**What it’s for:** Present pros/cons clearly and avoid repeating simple words.  
**Example:** “This approach is efficient; however, it may introduce complexity.”

===== Focus areas =====
  * Argument language: claim, evidence, counter-argument
  * Formal verbs: improve, reduce, increase, implement
  * Work/tech: scalability, reliability, security, performance
  * Collocations: conduct research, reach a conclusion, raise concerns
  * Phrasal verbs (selected): carry out, put off, rule out

===== Hard words (Glossary) =====
  * *evidence* /ˈevɪdəns/: bằng chứng
  * *counter-argument* /ˌkaʊntər ˈɑːɡjʊmənt/: phản biện
  * *complexity* /kəmˈpleksəti/: độ phức tạp
  * *scalability* /ˌskeɪləˈbɪləti/: khả năng mở rộng