例句與造句

1. There were eight tail feathers, up to long, anchored to a pygostyle and " rectrical bulb " ( see below ) as in modern birds.
2. The rectrical bulb and plough-shaped pygostyle allowing for tail fanning is also a unique characteristic of ornithurine birds, of which " Yixianornis " is among the earliest known.
3. More importantly, soft tissue preserved around the tail was interpreted as the remains of a rectrical bulb, suggesting that this feature was not in fact restricted to species with modern-looking pygostyles, but might have evolved much earlier than previously thought and been present in many enantiornitheans.
4. It's difficult to find rectrical bulbs in a sentence. 用rectrical bulbs造句挺難的