spacing piece

例句：

1. 1. The engineer measured the distance between the two pieces of metal to ensure proper spacing.
   工程师测量了两块金属之间的距离，以确保适当的间距。
2. 2. The carpenter used a spacer piece to level the floor before installing the new carpet.
   木匠使用一个间隔件来平整地板，然后安装新地毯。
3. 3. The scientist used a spacer piece to prevent the samples from touching during the experiment.
   科学家使用一个间隔件来防止样品在实验中相互接触。