yánjiūrényuán / tōngguò / chángqī / guāncè / fāxiàn / zhèzhǒng / niǎo / de / qiānxǐ / jùyǒu / míngxiǎn / de / guīzéxìng

研究人员通过长期观测，发现这种鸟的迁徙具有明显的规则性。

Through long-term observation, the researchers found that this bird's migration has a clear regularity.