参照群体
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population as reference
人口作为参考
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Also in reference to the activities of the population, it is possible that Forestville inhabitants were traveling during less safe times of the day, such as early in the morning, or during twilight.
还有，根据人们的活动来看，可能F地是在一天之中较不安全的时段上路，比如凌晨或黄昏。
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