when the floor was later opened for the discussion 求经典中文翻译,

直译 当后来对此讨论的发言权开放的时候
意译 当后来可以对此问题展开讨论的时候
再问： 不好意思，现将整句话告诉您，麻烦给个指点，谢谢。 when the floor was later opened for the discussion，Dr. Green participated by generously contributing input based on his vast experience.
再答： 当后来对此问题有发言权的时候，格林博士通过贡献他建立在渊博的经验基础上的知识来参与讨论