1·The mapping can be unidirectional or bidirectional.
映射可以是单向的或者双向的。
2·Channels can be unidirectional or bidirectional.
通道可以是单向的或双向的。
3·The process is unidirectional: one component makes the call and the other responds.
这个过程是单向的：一方发出请求，另外一方作出响应。
4·Before you start looking at the actual code, please note that the routers might be unidirectional or bidirectional.
在开始阅读代码之前，请注意路由器可能是单向或者双向的。
5·While this may seem to be directly analogous to a relational database's key mechanisms, there's one important difference: Most parsers treat these Pointers as unidirectional.
虽然这也许看来直接类似于关系数据库的键机制，但是有一个重要的差异：大多数解析器都将这些指针看作是单向的。
1·Power relation is embodies through unidirectional use of second person pronouns and occupational titles or honorific terms both in the original text and its translation.
原文和译文都是通过使用单向性的第二人称单数和职位称呼来体现权势关系；
2·This paper questions the validity of the claim that intra-sentential cataphoric reference is unidirectional , made in Zhao Hong & Shao Zhihong (2002).
本文对赵宏和邵志洪（2 0 0 2 ）“句内后照应单向性”论点的有效性提出质疑。