The correct use of the word "add" is that there is no such thing as "add to". It means to add something for nothing, to increase naturally. This word first came from the Qing Dynasty Baiyijushi's "Pottery Heaven Records" volume, the original text is "Cao Tang Cui living, dark born Ran Fang dust, flat add bright sunshine." The meaning is that the front of the grass green emerald green, showing a fragrant scenery, for this scene to add a few points of spring color added two meanings, one is "added for no reason, for no reason to increase", for example: you think this kind of idea will only add to their own worries. The second is the "natural increase", for example: every night on the square moncler outlet store organized square dance activities for the square near the people added a lot of fun.