2. Now 12 games into the quadrennial tournament, the World Cup is averaging 3.42 goals per game. Nigeria-Iran promises to bring that average down, but as long there is at least one goal in that game or the United States-Ghana match, the World Cup will head into its sixth day averaging at least 3.0 goals per game. The last time a World Cup averaged that many goals for an entire tournament was 1958 when Pele burst onto the scene and the 12 teams combined to average 3.60 over just 35 total matches.
3. n. 病毒，病原体
4. n. 青少年
5. n. 范围，行列，射程，山脉，一系列
6. Interviewers made their share of blunders, too.