九只猴子
Nine monkeys
以上为机器翻译结果，长、整句建议使用 人工翻译 。
对一组九只圈养猴子的八百多种不同呼叫的研究发现，呼叫者越年长，收到组内其它猴子的回应越多。
A study of more than 800 different calls between a group of nine monkeys in captivity found that the older the caller, the more responses they received from the rest of the group.
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