Tetruronic acid
[化] 丁糖酮酸
🧩 词语组成解析
🗣️ 情景例句
Is it that serious a problem, Grandpa?
这个问题有那么重要吗，爷爷？
My book has a dark blue cover.
我的书有一个深蓝色的封面。
Bones were carved into needles and tools, and the teeth were used to make necklaces.
骨头则雕琢成针和工具，牙齿用来作项链。