当猴子们一起猎杀其他动物时，它们会发生出一种笑声，黑猩猩在互相挠痒痒的时候也会发出笑声。
When monkeys get together to kill and eat somebody, they make a kind of a laughing noise and chimpanzees laugh when they tickle each other.
猴子一起猎杀其他动物时,它们会发生出一种笑声,黑猩猩胳肢时也会笑。
When monkeys get together to kill and eat somebody they make a kind of a laughing noise and chimpanzees laugh when they tickle each other.
当前的理论是，由于人类猎杀或食用了感染后的黑猩猩而传染上这种疾病的。
The leading theory is that it was picked up by people who hunted or ate infected chimpanzees.
当前的理论是，由于人类猎杀或食用了感染后的黑猩猩而传染上这种疾病的。
The leading theory is that it was picked up by people who hunted or ate infected chimpanzees.
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