shǐ / zǔ / niǎo / bèi / rèn / wéi / shì / yán / jiū / niǎo / lèi / qǐ / yuán / de / zhòng / yào / huà / shí

始祖鸟被认为是研究鸟类起源的重要化石。

Archaeopteryx is considered an important fossil for studying the origin of birds.