Data transfer can be bidirectional, and the sequence of data transfer is also maintained. However, there are some limitations to the protocol.
数据传输可以是双向的，数据传输的顺序也可以保持。
Some read the sequence backward, thus requiring bidirectional iterators.
一些算法反向读取序列，所以要求双向迭代器。
The sequence is stored as a bidirectional linked list of elements, each containing a member of type T.
这个序列采用双向链表的方式存储每一个元素，其中每一个元素的数据流行都是T。
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