substitute teacher
noun [ C ] US uk/ˈsʌb.stɪ.tʃuːt ˌtiː.tʃər/ us/ˌsʌb.stɪ.tuːt ˈtiː.tʃɚ/ (also substitute, sub); (UK supply teacher)
代课教师
a teacher who replaces teachers who are absent from work
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