1896年，贝克勒尔无意中发现了放射性物质，当他在一个抽屉里未显影的感光板上面留下一些铀矿后，感光板上留下了一个影子。
In 1896, Henri Becquerel had inadvertently discovered radioactivity when he left some uranium ore in a drawer on top of an undeveloped photographic plate, on which the uranium left a "shadow."
“不赞同”言语行为所涉及的问题对学生的策略选择未产生明显影响，但对教师的策略选择有着显著影响。
As far as the issues involved in the disagreement are concerned, while they do not influence the students 'choices of strategies, they remarkably influence the teachers 'choices.
化学灰雾：显影过度造成全面性增加的密度。是由于未曝光的卤化银被显影液感染所引致。
Chemical fog: Overall density produced by an excessive degree of development, due to unexposed silver halides being attacked by the developing solution.
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