求翻译：二、学习前先预习。这就意味着在你认真投入学习之前，先把要学习的内容快速浏览一遍，了解学习的大致内容及结构，以便能及时理解和消化学习内容。当然，你要注意轻重详略，在不太重要的地方你可是什么意思？

Second, the learning before the first preview. This means that before you seriously put into learning the first to learn quickly browse again, to understand the general content and structure of the learning, in order to understand and digest the learning content in a timely manner. Of course, you ha

2, before studying to get a preview. This means that you're serious in learning before you input to the content you want to learn quick, understanding the learning of the content and structure are generally in order to be able to understand and digest timely learning content. Of course, you need to

Second, learning before previewing. This means that before you seriously put into learning, first learning content to quickly browse again, learning more or