一线

In a sentence

• 政府出台了一系列政策，试图促使一线城市的房价回归稳定。

  The government has implemented a series of policies trying to stabilize the housing prices in first-tier cities.

  In this sentence, '一线' is used to describe 'first-tier' cities, indicating their advanced status or level compared to other cities.

• 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.

  Here, '一线' means 'front line,' referring to the forefront location in a situation, like rescue or battle efforts.

• 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 context, '一线' figuratively represents primary or foremost importance, highlighting priority.