internal standard area

例句：

1. 1.The internal standard area of the sample is measured by using a spectrophotometer.
   使用分光光度计测量样品的内标面积。
2. 2. The measurement of the internal standard area is crucial for the accuracy of the test results.
   内标面积的测量对于测试结果的准确性至关重要。
3. 3. In this study, we used an internal standard area of 0.5% to calibrate our analytical method.
   在这项研究中，我们使用了0.5%的内标面积来校准我们的分析方法。