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18mm

18mm

18mm

18mm

1

An 18mm lens can take a very wide photo , while a 250mm lens can get very close to far-off subjects .

一个焦距 18mm 的镜头可以拍摄一张非常宽幅的照片，而一个焦距 250mm 的镜头则可将遥远的物体拉得非常近。

3

The tube , typically 18 mm in diameter , circumferentially defines a surgical corridor .

典型的管状牵开器直径 18mm ，由其撑开一条手术通路。

4

Piston valve bore is 18mm, using 3 part stainless steel bobbins with cast iron rings .

活塞阀口径为 18mm ，使用铸铁环三部分不锈钢滚筒。

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