Effectiveness variance
[经] 有效性的差异
🧩 词语组成解析
effectiveness
[i'fektivnis]
n. 有效，有力;有效性;效益;效用;
variance
['vɛəriəns]
n. 变化，变动;不一致;分歧;<数>方差;
🗣️ 情景例句
He was more than helpful.
他不仅仅是帮忙。
Is it short way from here to the American Embassy?
从这里到美国大使馆要走一小段路。
Well, yes, I could do that. But I don't want to do anything alone.
哦，好，这事我能办。但我又不想一个人做事情。