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ravens test
乌鸦测试
以上为机器翻译结果，长、整句建议使用 人工翻译 。
To test whether ravens could follow gaze, Dr Heinrich and Dr Bugnyar used six six-month-old hand-reared ravens, and one four-year-old.
ECONOMIST: Now, it seems, even the bird-brained have theories of mind
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