Spectrosil
最纯的石英, 光谱纯石英
🗣️ 情景例句
to be with people--people his own age.
和别人交往像他那般年纪的人。
Never trust another what you should do yourself.
自己应该做的事，决不要委托别人做。
'It's a waste of time.
“这是浪费时间。