level filler

例句：

1. 1. The engineer used a level filler to ensure the concrete was evenly distributed.
   工程师使用一种水平填充物来确保混凝土均匀分布。
2. 2. The construction crew used level fillers to level the ground before starting work.
   施工队在开始工作前使用了水平填充物来平整地面。
3. 3.The level filler was carefully placed to ensure the stability of the structure.
   水平填充物被小心放置，以确保结构的稳定。