【释义】
an animal or plant that lived many thousands of years ago and that has been preserved, or the shape of one of these animals or plants that has been preserved in rock
化石:
【例句】
fossils of early reptiles
早期爬行动物的化石
【例句】
Marine sponges have a long fossil record (=their development has been recorded over a long period) .
海洋里的海绵化石记录历史悠久。
