英语翻译摘要:本文阐述了一些常用的求极限方法:如利用极限的定义求极限,利用等价代换求极限,利用已知的极限求极限,利用洛必

　　Abstract
　　This essay deals with some usual methods of calculating limits, including taking advantage of the definition of the limit, equivalence transformation, already known limits,L′Hospital rule, definite integral and so on.
　　Key words: limit,L′Hospital rule, definite integral