fossil fern造句

例句与造句

1. Fossil ferns and horsetails have also been found.
2. His studies of fossil ferns led to the founding of a new plant family, Botryopterideae.
3. The mud, now hardened into thin sheets of slate almost like pages in a book, also holds a rich assemblage of fossil ferns, trees, seeds and insects.
4. It's difficult to find fossil fern in a sentence. 用fossil fern造句挺难的