He has to attend a retained session.
他不得不参加一期的再培训。
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今天的几个句子是有关培训的：1. Invest heavily in training and mentoring. 加大培训和辅导方面的投资。2. We have an education and training center. 我们还有培训中心。3. Then finally is the technical training. 最后是技术培训。
更多精彩句子，等着您！