a third group experienced
Researchers raised baby mice from birth to weaning in either "summer" light cycles of 16 hours of light and eight hours of dark or "winter" cycles of eight hours of light and 16 hours of dark. A third group experienced 12 hours of light and 12 hours of dark a day。
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a third group experienced
第三组经历了
以上为机器翻译结果，长、整句建议使用 人工翻译 。