teaching assistant
US /ˈtiːtʃɪŋ əˌsɪstənt/
UK /ˈtiːtʃɪŋ əˌsɪstənt/

1.
assistente de ensino, monitor
a graduate student who assists a professor in teaching duties, such as grading papers, leading discussion sections, or conducting labs
:
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The teaching assistant helped students with their lab experiments.
O assistente de ensino ajudou os alunos com seus experimentos de laboratório.
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She works as a teaching assistant for the psychology department.
Ela trabalha como assistente de ensino para o departamento de psicologia.