lift line theory

例句：

1. 1. The lift line theory is a popular method for managing crowds in busy airports.
   提升线理论是繁忙机场管理人群的流行方法。
2. 2.This new model of the lift line theory has been widely adopted in various industries.
   这种提升线理论的新模型已在各个行业广泛采用。
3. 3.The lift line theory has proven to be effective in reducing waiting times for passengers.
   提升线理论已被证明能有效减少乘客的等待时间。