concrete placement

例句：

1. 1. The concrete placement was done carefully to ensure the stability of the structure.
   混凝土浇筑时非常小心，以确保结构的稳定。
2. 2.The engineer made a concrete placement plan before starting the construction.
   工程师在开始施工前制定了一个混凝土浇筑计划。
3. 3. The concrete placement was completed successfully, which greatly improved the durability of the building.
   混凝土浇筑成功完成，这大大提高了建筑物的耐久性。