狗狗和主人关系很好。

The dog and its owner have a good ___relationship.

他们的关系始于一次偶然的相遇。

Their ___relationship started with a chance encounter.

这项研究探讨了饮食与健康之间的关系。

The research explores the ___relationship between diet and health.

DNA测试证实了他们之间的血缘关系。

The DNA test confirmed their ___relationship by blood.