qiuchi0808
一线：常翻译成 front line 也可以使用连字符号front-line 用法举例：1.一线支援人员Front-Line Staff2.一线经理/主管Front-line managers / supervisors3.中华全国妇女联合会写慰问信给战斗在抗击非典一线的医务工作者，表达谢忱之意。China Women Federation wrote a letter to medical workers fighting SARS at the front line to extend gratitude and appreciation4. 学院拥有近2000人的专兼职教师队伍，800余名专任教师中50%以上具有高级职称或硕士、博士学位；兼任教师队伍相对稳定，多为来自周边高校、科研院所的优秀教师和生产、建设、管理一线卓有成绩的实践专家。The university has a team of almost 2,000 instructors with the full-time and the part-time included. Over fifty percent of more than 800 full-time faculty members possess senior titles or master and doctor degrees. The invited professionals are relatively stable. Most of them are excellent instructors from universities and institutes nearby and outstanding front-line experts from production, construction and administration. Among them are many well-known celebrities and authorities. 希望我的回答你可以满意
哆啦瞄瞄
一线城市first-tier city；biggest city我国目前被普遍公认的一线城市是上海、北京和广州。Shanghai, Beijing and Guangzhou are the most commonly known first tier cities.那时，美国公司的目标是在北京和上海这样的一线城市立足。Back then, the goal was to build a presence in first-tier cities like Beijing andShanghai.
