英语翻译假如数学分析是棵树木的话,那么极限就是它的根,函数就是它的皮.树没有根,活不下去,没有皮,只能枯萎,可见函数极限

If Mathematical Analysis were compared to a tree, then Limit would be like its root, Function its skin. A tree can’t live without its roots or simply wither with no skin. Hence the importance of Function Limit. The theory of Limit is the basis of Mathematical Analysis. It runs through the whole of Mathematical Analysis. The problem of Limit is also one of the difficult issues in Mathematical Analysis. There are myriad and complex ways to obtain Limit of Function (Series). There is no need for more illustration as to how to acquire Limit in line with some basic definitions. (For example, based on definitions, try to find Limit, , Algorithm of Function and Difference Product Quotient, and Function Limit via Continuity of Function etc.) Here’s the brief summary of the methods commonly used to find Function Limit.(译者注：非机器翻译,望采纳.)