They are trying to widen the discussion to include environmental issues.他们正试图扩大讨论范围，加入环境问题。He tried to open out the conversation.他试图扩大交谈的内容。Recently the company has been trying to increase its turnover by diversifying into other fields.近来这家公司试图扩大经营范围至其他领域，以此来增加营业额。