Add Colored Backgrounds in powerpoint.
在PowerPoint中添加彩色背景。
Mary's Birthday Black silhouettes over colored backgrounds.
玛丽的生日，黑色系列以上的彩色背景。
They recruited six hundred subjects, most of them undergraduates, and had them perform a variety of basic cognitive tests displayed against red, blue or neutral colored backgrounds.
他们招募了600名志愿者，大多数是本科生，并让他们在红、蓝，或中性背景下做各种基本的认知测试。
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