如果你不能变更工作距离，你在选择镜头上就免不了规限了。
If you cannot change the working distance, you are somewhat limited in choosing your lens.
设计一套特殊测厚规测量两个环形凸台的距离，这两个环形凸台位于两个同心孔内。
The article designs a special dial thickness gauges that measures the distance between ring-steps in two concentric bores.
镫骨与周围重要结构之间的空间狭小，尤其是与面神经、水平半规管距离小。
There are much more small Spaces between the stapes and the structures especially facial nerve and the lateral semicircular canal around it.
镫骨与周围重要结构之间的空间狭小，尤其是与面神经、水平半规管距离小。
There are much more small Spaces between the stapes and the structures especially facial nerve and the lateral semicircular canal around it.
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