Four-momentum
四维动量
🧩 词语组成解析
four
[fɔr]
num. 四;四个;第四;
n. 四的;四个一组之物;
🗣️ 情景例句
Easy does it, tom. don't get all worked up.
冷静点，汤姆，不要太激动。
I'm glad to hear about your graduation.
我很高兴听到你毕业的消息。
Oh! Is that a ball? Aren't all balls round?
噢，那是个球吗？难道所有的球不都是圆的吗？