Language Learning through Exposure

Every one of these lines emanating from the piece of information connects with one kind of exposure. The more exposures you get, the more connections your brain draws to that piece of information. The more repetitions of a given kind of exposure, the stronger that exposure becomes (imagine the lines getting thicker with each exposure). The stronger and more plentiful your exposures are, the more likely you are to remember the piece of information. [From Street-Smart Language Learning]

Could you fill each Read / Write / Listen / Speak with more sources?