The longer you wait to become at least semi-literate the harder the language of mathematics will be to master, just as again in any verbal language, but it can be done at any age.
而如果你想对数学语言至少有一些了解，那么你等待越久， 掌握难度就会越大，　同样就象任何一门口语一样． 只不过对于前者 不管你年龄多大，　都是可以做到的．