互易律失效 照相材料的光化当量差的英文

reciprocity failure

• 互易:    reciprocity
• 失效:    lose efficacy; los ...
• 照相材料:    photographic mater ...
• 的:    4次方是 The fourth po ...
• 光化:    actinic; photochem ...
• 当量:    equivalent; equiva ...
• 差:    send on an errand; ...