HSK 7-9
前线
qiánxiàn名
front line; military front; workface; cutting edge
救援队坚守在抗洪前线。
Jiùyuánduì jiānshǒu zài kànghóng qiánxiàn.
The rescue team held its position on the front line of the flood response.
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Appears across levels (7-9) in the HSK 3.0 word list.