middlings elevator

例句：

1. 1. The middling elevatoris the most common type of elevator ina building.
   中等电梯是建筑物中最常见的电梯类型。
2. 2. The middling elevator was not ableto reach the top floor due to itssize.
   中等电梯由于其大小无法到达顶楼。
3. 3. The middling elevator was used bythe elderly residents for their daily commute.
   中等电梯被老年人用来进行日常通勤。