kē / xué / jiā / tōng / guò / yán / jiū / sān / yè / chóng / huà / shí / liǎo / jiě / gǔ / dài / hǎi / yáng / huán / jìng

科学家通过研究三叶虫化石了解古代海洋环境。

Scientists study trilobite fossils to learn about ancient marine environments.