"Love is separated by mountains and seas, mountains and seas are uneven, and mountains and seas can also be flat. Flat is the heart." It means:

I and the person I love, Qian Shan, are separated by thousands of waters, and the mountains and rivers cannot be filled, so we can't meet each other. Even if mountains and seas can be filled, the most difficult thing to calm down is people's hearts. Saying that Qian Shan can't stop a change of heart. This is a hopeless love. If you don't change it, everything is possible and nothing can stop it.

This sentence comes from the famous poet Li Bai's Poems of Mountain Trees in the Tang Dynasty.

Although there is love between mountains and seas, love is deep and powerful, so that this love can level mountains and seas, and this love can remove all obstacles in the world. This means that nothing can stop their love.

Extended data:

The practical significance of this sentence:

1, the distance of love can't be built on the distance between mountains and seas, mountains can be flat and the sea can be filled. The distance between heart and heart is mysterious. It seems close at hand, but it seems out of reach. The hardest thing to measure is the human heart.

2. Even if there is a big obstacle between two people who really love each other, the obstacle can be overcome. The power of love is enormous. As long as you love each other enough, nothing can stop these two people from being together.