邀请学术专家用英语可以说成以下几种方式：

"I would like to invite an academic expert to our conference."

"Could you please extend an invitation to an academic expert for our panel discussion?"

"We are seeking to invite an academic expert to speak at our seminar."

"I am writing to invite an academic expert to contribute to our research project."

"Would it be possible to invite a renowned academic expert to deliver a lecture at our institution?"

根据具体情况，可以选择最合适的表达方式。