qualitative investigation

• 定性分析,质量集中分析

qualitative investigation的用法和样例：

例句

1. They are undertaking a qualitative analysis of the substance.
   他们正在对这种物质进行定性分析。
2. Qualitative analysis shows that water is made up of hydrogen and oxygen.
   定性分析表明水是由氢氧结合而成的。