This node is added to the beginning of the lookuplist and a reference to this node is returned as the import context.
把这个节点添加到查找列表的开头，作为导入上下文返回节点的引用。
2
A lookup data structure which is a linked list is then initialized.
然后初始化一个查找数据结构，这是一个链表。
3
This is similar to what is described in "Maximize the frequency of your lookups," and it prevents the keyword drop-down list from performing the lookup if the document is in read mode.