indoor staircase

例句：

1. 1. The architect designed abeautiful indoor staircase for the hotellobby.
   建筑师为酒店大堂设计了一个漂亮的室内楼梯。
2. 2. The elderly man used hiscane to climb the indoor staircase.
   老人用拐杖爬上了室内楼梯。
3. 3. The children were playing on the indoorstaircase when their mother called themfor dinner.
   孩子们在室内楼梯上玩耍时，他们的妈妈叫他们去吃晚饭。