Pixe
[化] 质子激发X射线发射分析
🗣️ 情景例句
Yes, I think that's what we stipulated.
对呀，我想那是我们所订定的。
An occasion lost cannot be redeemed.
时机失了无法挽回。
In the beginning they used to carve Chinese characters on stones to record important dates in history.
开始时，他们常把汉字刻在石头上，记载历史上重要的日期。