Cathodeluminescence
陰極(射線致)發(fā)光, 電子致發(fā)光, (陰極)電子激發(fā)光
??? 情景例句
Nothing.
沒有什么。
Excuse me, but may I ask a question?
對(duì)不起，我可以問個(gè)問題嗎？
So the number of stars that we know exist is now estimated at about 300 million million million.
因此，我們所知道的現(xiàn)有恒星數(shù)目估計(jì)約有30億×1000億顆。