These are fetal ear bones.

这些是胎儿的耳骨。

youdao

He was astonished to find that two of the ear bones in mammals corresponded to pieces of the jaw in reptiles.

让赖歇特感到吃惊的是，他发现哺乳类的两块耳骨与爬行类颚部的一些骨片相吻合。

youdao

Shubin writes: "the conclusion was inescapable: the same gill arch that formed part of the jaw of a reptile formed ear bones in mammals."

舒宾写道：“结论不可避免：构成爬行类颚部一部分的鳃弓，同样也构成了哺乳类的耳骨。”

youdao

And vibrations transmitted through their skeletons may also be picked up by their exceptionally large middle-ear bones.

ECONOMIST: Extra sensory perception