- 第一线 dìyīxiàn forefrontthe most direct or active level of participation in work, production, or a social initiative
- 一线希望 yīxiànxīwàng glimmera gleam of hope
- 一线生机 yīxiànshēngjī ray of hope(idiom) a chance of survival; a fighting chance; a ray of hope
- 一线之隔 yīxiànzhīgé fine linea very narrow or subtle difference between two states, qualities, or outcomes
- 一线微光 yīxiànwēiguāng gleama gleam of light
- 一线之间 yīxiànzhījiān fine linea subtle distinction or thin boundary between two different states or concepts
