Active area
[经] 有效面积
🧩 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;
area
['ɛrɪə]
n. 地区;区域，范围;面积，平地;领域;
🗣️ 情景例句
Eating salad is good for your health.
多吃色拉（蔬菜）对你的健康有益。
Lack of knowledge is darker than night.
没有知识比黑夜还要黑。
one ought to have at least two or three hobbies, and they must all be real.
至少应有两三种爱好，而且都比较实际。