If it is not a static class, you first need to declare the name of the field that will hold the reference to the parent class of the nested class before you get to the preview box.
如果它不是一个静态类，那么需要首先声明保存有对此嵌套类的父类的引用的那个字段的名称，之后才能看到这个预览框。
It's required for every high school students to preview the lessons before class.
课前预习功课是每位高中学生必须做的。
You should preview the lessons before class, concentrate on the lecture, and go over them...
要做到课前预习上课时专心听讲课后及时复习用英语怎么写。
Every student is able to get preview materials before the class, so that they can speak more and speak more fluently in class and later, outside.
学员可以在课前领取相应的沙龙课预习资料，以便在课堂上可以更自如地使用口语。
Every student is able to get preview materials before the class, so that they can speak more and speak more fluently in class and later, outside.
学员可以在课前领取相应的沙龙课预习资料，以便在课堂上可以更自如地使用口语。
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