USAGE NOTE 用法说明: learn, teach, study
Learn means to study or practise something so that you know more about it or know how to do it. learn 指学习或练习，以便知道更多或掌握方法:
She's learning to drive. 她在学开车。
They're learning about the French Revolution. 他们在学习法国大革命这段历史。
Teach means to explain to someone how to do something or tell them more about something, especially over a period of time. teach 指向某人解释如何做某事或告诉某人更多知识，尤其需要经过一段时间:
Who taught you to dance like that? 谁教你那样跳舞的？
It's important to teach children about their history. 教孩子本国历史很重要。
Study means to learn about something by reading books and going to classes at school, college etc. study 指通过阅读书籍、去学校上课而学习:
She's studying English at London University. 她在伦敦大学学英语。
John studies for three hours each night. 约翰每天晚上学习三小时。