Also , the topics in this section introduce some of the basic vocabulary and guidelines that you should understand when you start to create a windows forms application 本节中的主题还介绍一些在开始创建windows窗体应用程序时应当了解的基本词汇表和指南。
" level 01 " to " level 20 " are defined by frequence . if you are a high school student , you can select " level 01 " commonly ; if you are a college student , you can select " level 01 " to " level 03 " commonly ; under high school can select basic words 词汇级别中的level 01 level 20是根据单词出现的频率统计的，如果你是高中水平，选择level 01一般没有问题，如果是大学水平，一般可以选择level 01 level 03 ，高中以下水平可以选择基本词汇。
