a hard sell困难

Regenerative products could be a hard sell, because the concept is tough to define quickly, says Julie Stanton, associate professor of agricultural economics at Pennsylvania State University Brandywine.

宾夕法尼亚州立大学布兰迪万分校农业经济学副教授朱莉·斯坦顿表示，再生产品可能很难推销，因为这个概念很难被快速定义。