Second language acquisition (language teaching) ; Zweitspracherwerb (Unterricht) ; Foreign language teaching ; Sprache und Denken; Language and thought; Sprachliches Relativitätsprinzip; Denken und Sprache; Relativity (linguistic) ; Wahrnehmung und Sprache; Perception and language; Sapir-Whorf hypothesis; Linguistic relativity ; Simulation theory; Theory theory; Other minds ; Academic achievement; Language and intelligence ; Sprachverständnis (Lesen) ; Textrezeption (Zweitspracherwerb) ; Text reception (second language acquisition) ; Reading comprehension ; Kindersprache (pathol.) ; Child language (pathol.) ; Specific language impairment; SLI; Dysgrammatismus (Kindersprache) ; Dysgrammatism (child language) ; Handicapped language acquisition ; Dual language acquisition; Bimodal language acquisition; Spracherwerb (biling.) ; Language acquisition (biling.) ; Bilingual language acquisition ; Zweisprachigkeit; Bilingualism ; Multilingualism; Polylingualism; Plurilingualism ; Processability theory; Language comprehension (second language acquisition)