请你根据以厂提示，结合生活中的一个事例，用英语写一篇短文，谈谈微笑的作用。
The best example of universally understood body language may be the smile．A smile can help us get through difficult situations and find friends in a world of strangers．A smile can open doors and tear down walls．
注意：①无须写标题；
②内容只需涉及一个方面；
③词数为100左右。I still remember how nervous I was on my first day in the new school three years ago ，when I found it difficult to follow my teacher in the first English class。The teacher spoke English throughout the class ，which was totally different from the lessons I had taken before 。
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(答案→)I still remember how nervous I was on my first day in the new school three years ago ，when I found it difficult to follow my teacher in the first English class。The teacher spoke English throughout the class ，which was totally different from the lessons I had taken before 。
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