当我开始上小学的时候，我的老师魏先生告诉了我微笑的重要性。
When I started to go to primary school, my teacher, Mr. Wei told me the importance of smiling.
接着是第二段，即从不同的方面来探讨微笑的重要性。
The importance of smile can be explored from different aspects.
当我开始上小学的时候，魏先生就开始告诉我微笑的重要性。
When I start to go to primary school, Mr. Wei start to tell me the importance if smile.
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