这些具体的照片是在实验室中学生做实验时拍摄的。
These particular photographs were taken during an undergraduate laboratory session.
这些具体的照片是在实验室中学生做实验时拍摄的。
These particular photographs were taken during an undergraduate laboratory session .
这些具体的照片是在实验室中学生做实验时拍摄的。
These particular photographs were taken during an undergraduate laboratory session .
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