yán jiū rén yuán / fā xiàn / zhè zhǒng / niǎo / de / qiān xǐ / jù yǒu / míng xiǎn / de / guī lǜ xìng

研究人员发现，这种鸟的迁徙具有明显的规律性。

Researchers found that this bird's migration follows a clear pattern.