I said, how many riders?
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how many riders
有多少乘客？
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The researchers were able to divide their subjects very cleanly into co-operators, free-riders and reciprocators, based on how many tokens they contributed to the pool, and how they reacted to the collective contributions of others.
ECONOMIST: Human evolution
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