战争的最前线front line

直接从事某些活动的岗位forefront

• 向一线工人表示慰问

  send greetings to workers on the front line

a ray of

• 一线阳光

  a ray of sunlight

• 一线光明

  a ray of light

• 一线希望

  a ray of hope

• 他心里对美好的未来还抱有一线希望。

  He still has a ray of hope about his happy future.

指我国科技、经济水平比较发达的东部沿海地区eastern seabord; refers to the technologically and economically developed area of eastern China