The word "看懂" is formed by directly combining the character "看", which means "to look" or "to see", with the character "懂", which means "to understand". This juxtaposition creates a compound where the first character denotes an action and the second character denotes the result of that action, specifically indicating that the act of looking leads to comprehension, thus giving the word its meaning of "to understand by seeing" or "to read with understanding".