The influence of bilingualism and multilingualism on language learners has been studied and discussed by researchers for many years. In recent decades, research focus has been moved to the effects of second and third language acquisition processes on language learner's brains, which tends to have implications for future language learning. The purpose of this paper is to investi?gate possible implications for language learners of the efficiency in language learning, language learning strategies, and language use from the second and third language acquisition process, which tends to assist them to learn another language in an efficient way.