Four-vector
四元矢量; 四矢量
🧩 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
when Teddy Roosevelt was President.
在Teddy Roosevelt当总统的时代。
The homework took me a whole day.
做家庭作业花了我一整天的时间。
She must be at least thirty-five years old.
她至少也有35岁了。