Jefferson believed that a free man obtains knowledge from many sources besides books and that personalinvestigation is important.
杰弗逊认为，一个自由的人获得知识的方法除了阅读书籍外，还有很多的来源，其中，个人调查是非常重要的。
2
Jefferson believed that a free man obtains knowledge from many sources besides books and that personalinvestigation is important.
杰弗逊认为：一个自由人除了书本之外还可从其他地方获取知识，而且个人调查研究也很重要。
3
Hadmy uncle referred to these cases by name instead of merely by number, Ishould have attempted some corroboration and personalinvestigation;but as it was, I succeeded in tracing down only a few.