metal baluster

例句：

1. 1.The new elevator has a metal baluster in the middle, which makes it easy to reach the top floor.
   新电梯中间有一根金属扶梯，这使得到达顶层变得容易。
2. 2. The construction workers were using metal balusters to support the weight of the building.
   建筑工人正在使用金属扶梯来支撑大楼的重量。
3. 3. The metal balusters on the balcony are rusted and need to be replaced.
   阳台上的金属扶梯生锈了，需要更换。