一个英语句子中的that是引导什么从句,它的先行词是什么

We can deduce from the pictures that the photographer is trying to attract our attention to the issue of heavy traffic.
that the photographer is trying to attract our attention to the issue of heavy traffic.是宾语从句,作deduce的宾语.这个句子可以这样写：
= From the pictures we can deduce that the photographer is trying to attract our attention to the issue of heavy traffic.
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同位语从句，是解释说明pictures的

同位语从句，从the photographer is trying to attract our attention to the issue of heavy traffic.看不缺任何成分，所以 that 只起引导词作用，没有意思，不能省略，