Active constraint
[计] 有效约束
🧩 词语组成解析
active
['æktiv]
adj. 积极的，活跃的，有生气的;迅速的，敏捷的;有效的，起作用的;
n. [语法]主动语态;积极分子，活跃的人;
🗣️ 情景例句
But how did you know the party was for you?
但是你怎么知道派对是为你举办的呢？
We can't write very well.
我们不能写那么多。
I had a letter from my sister yesterday.
昨天我收到了姐姐的一封信，