岳大桥和哲朗松泽是日本猴类研究中心的研究员，他们在2002年7月到2003年3月以及2004年4月到9月这两段时间里对博苏地区的黑猩猩进行了深入的观察，同时也记录了6个案例来反映5只不同的黑猩猩是如何破解它们所遇到的陷阱的。

Ohashi, a research fellow at the Japan Monkey Center, and colleague Tetsuro Matsuzawa observed the Bossou chimpanzees from July 2002 to March 2003 and then again from April to Sept. 2004.

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这是日本京都大学类人猿研究院的哲朗松泽，他训练黑猩猩识别一到九的数字。

You're listening to Tetsuro Matsuzawa of the Primate Research Institute at Kyoto University, in Japan. Matsuzawa trained chimps to recognize the Numbers one through nine.

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“我们很惊讶地发现这一点，”京都大学灵长类动物研究所的哲郎松泽说。

"We were very surprised to find this," Tetsuro Matsuzawa of the PrimateResearch Institute at Kyoto University said.

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