第一线

第一線
dìyīxiàn
  1. front line
  2. forefront

CEDICT

Entry Composition

1 第一 dìyī
  1. first
  2. most important; primary; foremost
=2 线 xiàn variant of 线 xiàn
=2 线 xiàn
  1. thread
  2. string
  3. wire
  4. line
  5. (after a number) tier (unofficial ranking of a Chinese city)

classifiers: 條, 股, 根