Poynting vector
[化] 坡印亭矢量
🧩 词语组成解析
[人名] 波因廷
🗣️ 情景例句
If it ain't broke, don't fix it.
东西还没坏，就别急去修它。
If you don't take my advice,you'll be sorry.
如果你不接受我的忠告，你将会遗憾的。
She entered the station twenty minutes before the train was due,
在火车进站20分钟前她就进了车站。