Activity vector
[计] 活动向量
🧩 词语组成解析
🗣️ 情景例句
I'm totally exhausted by the time I get home.
等我回到家，已经累得精疲力竭了。
My brother wants to learn how to swim.
我的兄弟要去学游泳。
Indeed, we lack practice and experience nowadays in dealing with primitive conditions.
确实，我们今天缺乏对付原始环境的实践和经验。