The study involved experiments conducted on four jungle crows, the type most commonly found in Japanese cities and often regarded as an urban nuisance due to their booming population.

他们对丛林中四只乌鸦进行了试验研究。这四只乌鸦都是日本城市经常看见的品种，由于繁殖过快，常常看作是城市祸害。

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The study involved experiments conducted on four jungle crows, the type most commonly found in Japanese cities and often regarded as an urban nuisance due to their booming population.

他们对丛林中四只乌鸦进行了试验研究。这四只乌鸦都是日本城市经常看见的品种，由于繁殖过快，常常看作是城市祸害。

youdao