Optron
光导发光元件
🗣️ 情景例句
By the way, will we be able to get a refund on this cancellation?
顺便问一下，我们取消后可拿回定金吗？
Try to be there by 8:15 the airport will be crowded.
尽量在8点15分以前赶到那里，到时机场会很拥挤的。
He made the first telephone.
他发明了第一部电话。