feather tract造句

例句与造句

1. Twitchers ( and birders in general ) will also use a mixture of scientific and slang terms for feather tracts and so on.
2. The newly hatched nestlings are altricial, gaping immediately for food, and developing downy feather tracts and opening their eyes by the third or fourth day.
3. It's difficult to find feather tract in a sentence. 用feather tract造句挺难的