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respiratory system
Moderate exercise and a balanced diet are important for maintaining the health of the respiratory system.
(slang) person of strong vanity
He is a person of strong vanity who reads self-improvement books.
manual labor / a manual laborer, a blue-collar worker
He decided to start a manual labor job.
(organic chemistry) alkyne
Alkynes play an important role in organic chemistry.
(organic chemistry) alkene
Alkenes play an important role in organic chemistry.
(organic chemistry) alkane
Alkanes are basic components of organic chemistry.
an African American
He is studying the history of African Americans.
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