translation.en: 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.
translation.zh: 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．