Before revision:  In humans, language is part of a larger system for acquiring, representing, and communicating about objects and situationsin the physical and social world, and future machine language models should emulate such a system .
After revision:  In humans, language is part of a larger system for acquiring, representing, and communicating about objects and situationsin the physical and social world, and future machine language models should emulate such a system, which extends the ability of these systems to exploit context and has contributed to remarkable breakthroughs. Nevertheless, most current models focus exclusively on language-internal tasks, limiting their ability to perform tasks that depend on understanding situations. These systems also lack memory for the contents of prior situations outside of a fixed contextual span .