Poynting vector
[化] 坡印亭矢量
🧩 词语组成解析
[人名] 波因廷
🗣️ 情景例句
Keep a small English dictionary with you at all time.
随身携带一本小英文字典。
It is an equal failing to trust everybody,and to trust nobody.
信任一切与不信任任何人，同样是弱点。
It's a good opportunity!
好机会！