主要货种 meaning in English

principal commodity

In chapter 1 , the author introduces the general situation and the main categories of cargo of dalian port
在第一章对大连港的基本情况进行了介绍，对大连港装卸的主要货种进行了叙述。
Namely , bulk handling will significantly influence the input & output and long term development of port . this paper will focus on the study of the reform plan to the bulk handling system of port , so as to further strengthen the comprehensive capacity of the system and to meet the current requirements of bulk handling of the port
散货作为张家港港口的主要货种之一，根据全港的发展战略定位和要求，本文拟在通过对张家港散货作业系统的综合研究与分析，解决存在的主要问题，提升港口综合通过能力，适应港口发展需要。