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
Michelle was chosen to do
Michelle被挑选去作
It was quite good. But it was awfully long.
班机很好，就是时间太长了。
Oh, a lot of different things! One machine helps them to put rice in bags.
能做好多不同的事情呢！比如能帮助农民把大米装袋等。