graduated flasks

例句：

1. 1. These graduated flasksare used for measuring different concentrations of chemicals.
   这些分级烧瓶用于测量不同浓度的化学物质。
2. 2. The chemical engineer used graduated flasksto measure the concentration of the solution.
   化学工程师使用分级烧瓶来测量溶液的浓度。
3. 3. The chemist carefully measured thevolume of the graduated flasks before mixingthe chemicals.
   化学家小心地测量了分级烧瓶的体积，然后混合化学品。