The museum tour guide explained how these dinosaur bones fossilized over millions of years.

博物館導覽員解說這些恐龍骨頭如何歷經數百萬年變成化石。

Our travel brochure features a beach where visitors can see trees that fossilized long ago.

我們的旅遊手冊介紹一處海灘，遊客可以看到很久以前就已石化的樹木。

The mining company's report noted that the plant remains had fossilized deep underground before excavation.

這家礦業公司的報告指出，那些植物殘骸在開挖前已於地底深處變成化石。