Language Learning and Development《语言学习与发展》(季刊). Language Learning and Development (LL&D) serves as a vehicle for interaction among the broad community of scholars and practitioners who investigate language learning, including language learning in infancy, childhood, and across the lifespan; language in both typical and atypical populations and in both native- and second-language learning. LL&D welcomes scholars who pursue diverse approaches to understanding all aspects of language acquisition, including biological, social, and cross-cultural influences, and who employ experimental, observational, ethnographic, comparative, neuroscientific, and formal methods of investigation.