main line

1. N the trunk route between two points, usually fed by branch lines 干線

2. N (as modifier) 干線的

a main-line station

3. V to inject a drug into a vein 將藥物注射進(jìn)動(dòng)脈[slang]

4. ADJ having an important position, esp having responsibility for the main areas of activity 有重要職位的