1. The doctor used a gastroscope to examine the inside of the patient's stomach.
医生使用胃内窥镜检查了病人的胃内部。
2. The gastroscope allows doctors to visually inspect the lining of the stomach and detect any abnormalities.
胃内窥镜可以让医生对胃内部进行视觉检查，并检测出任何异常情况。