lens barrel

例句：

1. 1. The camera has a long lens barrel that allows for close-up shots.
   这台相机有一个长镜头筒，可以拍摄近距离的照片。
2. 2. The lens barrel of the telescope is made of glass to improve its clarity.
   望远镜的镜头筒是由玻璃制成的，以提高其清晰度。
3. 3.The lens barrel was damaged during transportation, causing the picture quality to deteriorate.
   在运输过程中，镜头筒受损，导致图片质量下降。