variable-focal-length lens

例句：

1. 1. The camera has a variable focal length lens that allows it to focus on different subjects.
   这台相机有一个可变焦距镜头，可以调整焦距来聚焦不同的物体。
2. 2. The photographer used the variable focal length lens to capture the changing colors of the sunset.
   摄影师使用可变焦距镜头捕捉了日落时分色彩的变化。
3. 3. The scientist developed a variable focal length lens that could adjust its focal length in real-time.
   科学家研发了一种可实时调整焦距的变焦距镜头。