On the left side of the door is posted "Good marriage is promoted by the association";

"A lover was born" is posted on the right side of the door.

Why do you want to post it like this: first, identify the upper and lower couplets of a couplet. Because the suffix "Lenovo" is a conjunction, the sentence "A couple was born" is the upper part, and the rest of the sentence is the lower part. Secondly, it is necessary to distinguish the position of the door frame. Taking the orientation of the house as the standard, the left is upper and the right is lower, which inherits the ancient habit of writing from left to right.