Efficiency variance
[经] 效率差异
🧩 词语组成解析
variance
['vɛəriəns]
n. 变化，变动;不一致;分歧;<数>方差;
🗣️ 情景例句
Yes, indeed.
对 ，正需要。
The wise man has long ears and a short tongue.
聪明人耳朵长，嘴巴短。
and comforted by the thought of the help he was bringing to his friend,
想到能对朋友有所帮助，他感到欣慰，