Pentafluorization
五氟化反应
🗣️ 情景例句
That's why I'm reading my paper and having my coffee
这就是今天早上为什么我看报纸喝咖啡
He is the top condition.
他的身体情况处在巅峰状态。
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。