Flexible sigmoidoscopy is an exam of the rectum and the lower colon using a viewingtube (a short version of colonoscopy).
灵活的乙状结肠检查是通过一个可视管道对直肠和降结肠进行的一种检查。
2
CATHODE RAY tube, An evacuated glass tube with a viewing screen, used for displaying information.
阴极射线管，一个具有显象屏幕的真空玻璃管。用于显示信息。
3
The image quality will become worsen for the append noisiness when it be translated and strengthened with the image tube of shimmer night viewing device.