working distance of microscope

例句：

1. 1. The microscope is used to examineobjects at a working distance of about10 cm.
   显微镜用于在大约10厘米的工作距离下观察物体。
2. 2. Thescientist adjusted the focus to achieve a betterworking distance for the experiment.
   科学家调整了焦距，以获得更好的实验工作距离。
3. 3. The researcher needs to maintain agood working distance between the specimen and thelens to avoid damage.
   研究人员需要保持标本与镜头之间的良好工作距离，以避免损坏。