the front line
noun/ðə ˌfrʌnt ˈlaɪn/
/ðə ˌfrʌnt ˈlaɪn/
[singular]- an area where the enemies are facing each other during a war and where fighting takes place
前线 - Tanks have been deployed all along the front line.
整个前线全都部署了坦克。 - in/on the front line The regiment was sent to fight in the front line.
这个团被派往前线作战。
- Tanks have been deployed all along the front line.
- the most important position in a debate or an area of work
（辩论或工作的）第一线，关键位置 - in the front line (of something) a life spent in the front line of research
在研究的第一线度过的一生 - on the front line (of something) They are on the front line, talking to the customers about our products.
他们在第一线，与客户谈论我们的产品。
- in the front line (of something) a life spent in the front line of research