Michelle Cha "A teaching credential is highly desirable , and many positions require part-time teaching . " There are no words whose meaning I don't know , the meaning but I don't understand this sentence , especially the " A teaching credential is highly desirable" part. Please make help me understand the sentence.
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Michelle Cha"A teaching credential is highly desirable, and many positions require part-time teaching."
There are no words whose meaning I don't know,the meaning