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重点讲解：
1. social media 社交媒体
Social media is often where people take a stand on an issue.
社交媒体通常是人们对某一问题表达自己立场的平台。
2. write down 写下；记下；把...描写为
Write down what Bob did yesterday in your exercise book.
在练习本上写下鲍勃昨天所做的事情。
3. in total 总计；总共
I was with my husband for eight years in total.
我和我丈夫在一起总共8年。
4. be known for 因...出名
She is best known for her work on the human brain.
她在对人脑的研究方面最为知名。
