What do you mean, the sky is boundless and the ground is connected?

This sentence means that if there is no place where heaven and earth meet and there are no obstacles, you can be with separated people.

This is a romantic expression, symbolizing an ideal state of interpersonal relationships such as friendship and love. This sentence comes from the episode Dang of Qiong Yao's drama Princess Zhu Huan, which means that only when the sky is not angular and the ground is not closed can we leave you, expressing people's infinite attachment to friendship, love and parting.