沙袋

例句：

1. 1. He put the sandbag on the ground to protect his house from floods.
   他在地上放了一个沙袋来保护他的房屋免受洪水侵袭。
2. 2. The soldiers used sandbags to reinforce the walls of their fortress.
   士兵们使用沙袋加固了他们的堡垒的墙壁。
3. 3. The children were playing with sandbags in the park.
   孩子们在公园里用沙袋玩耍。