假定你是一名中学生，名叫王林。你们在这个星期刚刚学了“First Aid”这个单元，请你就“掌握急救知识是必要的”这个主题发表你的看法，用英语写一篇100—120词的短文，向学校英文报Energetic Teens投稿，主要内容包括：
①什么是急救知识；
②结合自己生活中所碰到的例子，简要谈谈你对掌握一定急救知识必要性的认识。
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