A man USES a photographic film strip to observe an annular eclipse near the Kibera slums in Kenya's capital Nairobi, January 15, 2010.
2010年1月15日，肯尼亚首都内罗毕，基贝拉贫民窟附近，一个男子用相片底片条来观察日环食。
For photographic measurement purposes, a strip of material having a transparency which varies in steps along its length is often used.
在摄影测量中，经常用到一种测试条，它的透明度沿长度方向逐级变化。
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