Poynting vector
[化] 坡印亭矢量
🧩 词语组成解析
[人名] 波因廷
🗣️ 情景例句
have been busy at work this morning
一早上都在忙着
We enjoyed ourselves very much.
我们玩的很开心。
At this time, the man downstairs was trying to sleep.
这时楼下人正试图入睡。