系词

例句：

1. 1. He is the only person who can connect the two pieces of information.
   他是唯一一个能将这两部分信息联系起来的人。
2. 2. The connection between the two countries has been strengthened.
   两国之间的联系已经加强。
3. 3. The relationship between them is complex and multifaceted.
   他们之间的关系复杂且多维。