lie [stand] ((between));intervene ((between))
- 彼らの間にはいつも遠慮の気持ちが介在していた
- There was always some reserve between them.
- 第三者の介在で交渉は難航している
- Because of the intervention of a third party, the negotiations are not going well.
- これには別の問題が介在している
- There is another problem involved here.