This is the 3881st most frequent Chinese word.
一线
"一线" means "frontline" or "top-tier."
Here, '一线' means 'front line,' referring to the forefront location in a situation, like rescue or battle efforts.
在那次突发事件中,他始终坚守在救援的一线。
During the emergency, he continuously held his position on the front line of the rescue.
In this context, '一线' figuratively represents primary or foremost importance, highlighting priority.
她的设计理念总是把顾客的需求放在一线。
Her design philosophy always prioritizes the customers' needs.
In this sentence, '一线' is used to describe 'first-tier' cities, indicating their advanced status or level compared to other cities.