Optical efficiency
[电] 光效率
🧩 词语组成解析
🗣️ 情景例句
What are the flowers for, Richard?
究竟为什么送花 ，Richard？
We intend to place large regular orders, and would therefore like to know what quantity discounts you allow.
我方将定期大量订购，因此想知道你方给多少数量折扣。
He did not know from which part of Africa his ancestor had come.
他不知道祖先来自非洲的什么地方。