In the training (train) sessions, there were a lot of discussions on the differences between the two types of selling styles.
翻译:
在培训课上，大家就两种推销方式之间的差异进行了大量讨论。
知识点解析:
词性转换。括号里的 train 是动词，这里需要动名词/名词 training 作定语，修饰 sessions（培训课）。