In my life, I have encounter many teachers. They all have different personality. Among all the teachers, I have a very specially teacher. You may be very surprised at my answer--the dictionary. The dictionary is a living teacher. When I was young, I really love to turn to the dictionary for help. Whenever I come across a new word, I will consult it and know its definition. I guess every student, their first teacher is dictionary. 
The dictionary is a good teacher. It is convenient, inexpensive and contained almost everything. Sometimes I am just too shy to ask my teachers about the questions I have on my mind. Then I will turn to my dictionary for help. She is quite and never reject my request. The more I use it, the more familiar I will become with it. Right now, I really good at finding the page I am looking for. 
As far as I concern, a dictionary is a necessity especially when you need to learn a foreign language. But you should remember that you can not never become too dependent on it. Basic language skills don’t come from dictionaries, but from practices. Anyway, it’s still my favorite teacher. 
在我生命中，我遇到过很多老师。他们有着不同的性格特点。在所有的老师当中，我有一位非常特别的老师。你可能会对我的答案感到惊讶，那就是字典。字典是位好老师。当我还小的时候，我很喜欢翻阅字典。当我遇到一个新词，我就会查字典并弄明白它的含义。我想每一位学生的第一位老师都是字典。
字典是个好老师。它不仅方便、便宜，还包含了所有的东西。有时候我过于害羞，不敢向自己的老师提问，我就会求助于字典。它不仅安静，也从来不会拒绝我的请求。我用得越多，就越熟悉它。现在，我非常擅长查找自己所需的页码。
就我看来，如果你要学习外语，那么字典就是必需品。但是你不能过分的依赖于它。基本的语言技巧不会来自于字典，而来自于实践。但无论如何，字典是位好老师。