1·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."
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。
2·"In 1839, French scientist Edmund Becquerel discovered (How Solar)" the photoelectric effect.
在1839年,法国科学家埃德蒙·贝克勒尔发现了(太阳能)光电效应。