前线 + Noun / 在 + 前线
前线 (qiánxiàn) is a noun meaning "front line" or "frontline," originally a military term referring to the foremost position in a battle. In modern usage, it is also used metaphorically to describe people working at the forefront of any effort, such as healthcare workers during a crisis. It conveys a sense of being in the most active or critical position.
那些医护人员一直在抗疫前线。
Nàxiē yīhù rényuán yìzhí zài kàngyì qiánxiàn.
Those medical workers have been on the front lines fighting the pandemic.
记者赶到了灾区前线进行报道。
Jìzhě gǎndào le zāiqū qiánxiàn jìnxíng bàodào.
The reporter rushed to the front lines of the disaster area to report.
前线的工人们日夜不停地抢修道路。
Qiánxiàn de gōngrénmen rìyè bù tíng de qiǎngxiū dàolù.
The workers on the front lines have been repairing the roads around the clock.