be tied up with 忙得脱不开身；忙于；与……有密切关系

【例句】
I've got a feeling that the death may be tied up with his visit in some way.
我有种感觉，死亡似乎和他的来访有某种关联。

I'm tied up with my paper.
我的论文让我忙得脱不开身。