Looking from the cognition angle that, listens and reads is the language understanding and the information input ability, mediates writes expresses the thought, is the information output skill.
Looking from the cognition angle that, listens and reads is the language understanding and the information input ability, mediates writes expresses the thought, is the information output skill.
从认知角度看，听和读是语言理解和信息输入能力，说和写是表达思想，是信息输出技能。