Definition
To tie something in means ensuring ideas or statements are in agreement or closely related, or making them agree or connect closely.
（使）一致；（使）相关联
During the discussion on economic policy, he worked hard to tie the new regulations in with the previous plans.
在讨论经济政策时，他努力将新法规与之前的计划相结合。
The article attempts to tie scientific research in with current social issues.
这篇文章试图将科学研究与当前的社会问题相联系。
It is crucial to tie in the plans of various departments to successfully implement the new strategy.
成功实施新策略的关键在于将各部门的计划相结合。