lifting line theory

例句：

1. 1. The lifting line theory is a popular method for lifting heavy objects.
   提升线理论是一种常用的起重方法。
2. 2.The lifting line theory has been widely used in the construction industry.
   提升线理论在建筑行业中得到了广泛应用。
3. 3. The lifting line theory is based on the principle of levers, which can be used to lift heavy objects.
   提升线理论基于杠杆原理，可以用来提起重物。