Differentials
n. 差异( differential的复数形式 ); 工资级差; （汽车）差动齿轮; 分速器
🗣️ 情景例句
What did you do?
那你怎么办呢？
Wake up and smell the coffee!
面对现实吧！
local epidemics of this disease could be created.
就可以使这种疾病在一个地区蔓延起来。