Triacetamide
三乙酰胺
🗣️ 情景例句
Let me give you more detail.
让我来详细说明。
I don't have a phonograph,either.
我也没有留声机。
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。