sidewalk joist

例句：

1. 1. The sidewalk joist is the main support for the walkway.
   人行道梁是人行道的主要支撑。
2. 2. The joist was installed to ensure the stability of the building.
   这个柱子被安装来确保建筑物的稳定性。
3. 3.The joist needs to be checked regularly to prevent any structural issues.
   这个柱子需要定期检查，以防止任何结构问题。