医生使用特殊仪器精确定位了肿瘤的位置。

The doctor used special equipment to ___pinpoint the exact location of the tumor.

科学家能够精确定位地震的震中位置。

Scientists were able to ___pinpoint the exact epicenter of the earthquake.

我们需要用显微镜才能观察到这些微小的变化。

We need a microscope to observe these ___pinpoint changes.