Optronics
光电子学, 光导发光学
🗣️ 情景例句
Take care, and have a nice flight.
请保重！祝你一路顺风！
It is easier to pull down than build.
败事容易成事难。
At night, the children always do their homework.Then they go to bed.
晚上，孩子们总是做作业，然后去睡觉。