单语范例（未经PONS编辑处理）
The endoscope is quickly passed through the stomach and through the pylorus to examine the first and second parts of the duodenum.
en.wikipedia.org Alternatively, body position changes and abdominal support from external hand pressure can often straighten the endoscope to allow the scope to move forward.
en.wikipedia.org Then the surgeon slides the endoscope into the nasal choana until the sphenoid ostium is found.
en.wikipedia.org The semirigid endoscope allows for visualization of the diseased process, but the stiffness allows manipulation and navigation of the internal salivary anatomy.
en.wikipedia.org