操作转换成一个数组项查询或者一个对象成员查询。
The operation becomes either an array item lookup or an object member lookup.
有四种数据访问类型：直接量，变量，数组项，对象成员。
There are four places to access data from: literal values, variables, array items, and object members.
这个符号哈希表指向被DT_SYMTAB数组项引用的符号表。
This hash table refers to the symbol table referenced by the DT_SYMTAB element.
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