Optical efficiency
[电] 光效率
🧩 词语组成解析
🗣️ 情景例句
Do you have to act like that?
你非得那么做吗？
I'll know when the time comes.
到时候就知道了。
One day, the man downstairs went to talk to the man. He went upstairs and knocked the door.
一天，楼下人去找楼上人谈谈。 他上楼敲门。