the brain
"Das Gehirn verarbeitet neue Vokabeln im Schlaf."
"The brain processes new vocabulary during sleep."
to learn
"Er lernt jeden Tag zehn neue Wörter."
"He learns ten new words every day."
fluent / fluently
"Sie spricht fließend Deutsch."
"She speaks German fluently."
to master / command
"Es dauert Jahre, eine Sprache zu beherrschen."
"It takes years to master a language."
Your personal German↔English second brain
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Spaced repetition optimization.
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Semantic compound awareness.
Graduation exams & practice.