例句與造句

1. Nasal placodes originate on the frontonasal prominence from the ectoderm.
2. By the upgrowth of the surrounding parts these areas are converted into pits, the olfactory pits, which indent the frontonasal prominence and divide it into a medial and two lateral nasal processes.
3. It's difficult to find frontonasal prominence in a sentence. 用frontonasal prominence造句挺難的