求翻译：取锥形瓶若干，加入等量液体培养基和菌悬液，并加入适量磁粉，使各锥形瓶内磁粉浓度分别为0g/L、2g/L、4g/L、6g/L、8g/L、10g/L、12g/L，置于30℃恒温水浴振荡器中，每隔1h测定吸光度，从而绘制含不同浓度磁粉的微生物生长曲线，结果如图2-3所示。是什么意思？

Take cone bottle several, joined equivalent liquid medium and bacteria suspended liquid, and joined moderation magnetic powder, makes all cone bottle within magnetic powder concentration respectively for 0g/L, and 2g/L, and 4g/L, and 6g/L, and 8g/L, and 10g/L, and 12g/L, placed 30 ℃ thermostat water bath oscillation Manager in the, each isolation 1h determination suction photometric, thus draws containing different concentration magnetic powder of microbial growth curve, results as Figure 2-3 by shows.