While economists are free to theorize, company chairmen are concerned with actualities.经济学家们可自由提出理论，而公司总裁们则关心的是现实情况。Among those present are the chairman and vice-chairmen.在座的有主席和几位副主席。While economists are free to theorise, company chairmen are concerned with actualities.经济学家们可自由创建理论，公司总裁们则关心现实情况。