求翻译：营销渠道也是一种复杂的、长期的人际管理，在短期内很难被模仿。近几年来，关于对通信业营销渠道方面的论文、著作及研究成果层出不穷。是什么意思？

Marketing channels is a complex, long-term personal management, hard to imitate in the short term. In recent years, the papers on the marketing channel of communications, works and endless stream of research results.