Meaning: This sentence describes the children's playful behavior in the snow, emphasizing their laughter and snowball fight.
Choice of Words: To "laugh" is to make a sound expressing amusement or joy. A "snowball" is a ball made of packed snow, often used for throwing in snowball fights. "At each other" means towards or against one another. When you put these words together, you get a picture of children having fun in the snow, laughing and throwing snowballs at each other.