instrument with electrostatic screening

例句：

1. 1. The scientist used a microscope to observe the sample.
   科学家使用显微镜来观察样本。
2. 2. The engineer designed an innovative machine for the factory.
   工程师为工厂设计了一台创新的机器。
3. 3. The doctor uses a stethoscope to check the patient's heart rate.
   医生使用听诊器检查患者的心率。