Spectrosil
最纯的石英, 光谱纯石英
🗣️ 情景例句
What happened?
发生了什么事？
Take time when time cometh,lest time steal away.
时来必须要趁时，不然时去无声息。
The truth is that when mistakes occur, they are more likely to be ours than theirs.
事实上，差错很可能是我们自己，而不是铁路当局的。