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manual labor / a manual laborer, a blue-collar worker
He decided to start a manual labor job.
sympathetic nervous system
The sympathetic nervous system controls the body's stress response.
The International System of Units, SI.
The International System of Units is a standard of measurement widely used around the world.
the International System of Units
The International System of Units is the standard measurement system used by scientists all over the world.
a peripheral nervous system
The peripheral nervous system plays a role in transmitting commands from the central nervous system to various parts of the body.
lithium aluminium hydride
Lithium aluminium hydride is necessary for this chemical reaction.
an African American
He is studying the history of African Americans.
parasympathetic nervous system
The parasympathetic nervous system helps our body to relax and conserve energy.
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