main line
noun [ C ] uk/ˌmeɪn ˈlaɪn/ us/ˌmeɪn ˈlaɪn/
（铁路的）干线
an important railway route between large towns or cities
the main line between New York and Philadelphia 连接纽约和费城的铁路干线
江苏热线英汉汉英双解词典包含207361条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。