Postaural arches
[医] 鳃弓
🧩 词语组成解析
n. 弓形；拱桥（arch的复数形式）
🗣️ 情景例句
having to take care of the baby all weekend.
整个周末照顾孩子。
I ought to go right away.
我应该立刻去。
and so the tools of long ago have remained when even the bones of the men who made them have disappeared without trace.
因此，尽管制造这些工具的人的骨头早已荡然无存，但远古时代的石头工具却保存了下来。