fixed-focus objective

例句：

1. 1. The photographer used a fixed-focus lens to capture the perfect shot.
   摄影师使用了一个固定焦距的镜头来捕捉完美的画面。
2. 2. The scientist used a fixed-focus lens to observe the intricate detailsof the sample.
   科学家使用了一个固定焦距的镜头来观察样本的复杂细节。
3. 3. The engineer designed a fixed-focuslens for his new project.
   工程师设计了一个固定焦距的镜头用于他的新项目。