On the one hand, since people cannot live in a vacuum, residing in the community means we can be unavoidably influenced by surroundings, so learning(small changes) occurs during each interaction and human activities. On the other hand, learning serves as an essential way of protection, with the intention of getting involved in the community and survive, people are required to learn social principles and how to behave. In the real world, I found children are more flexible and adaptive, so they always achieve better performance in language learning when compared with adults.