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。