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
There must be some way to put my mind to good use.
总会有办法让我发挥才智。
She is free any time you need help.
你需要帮忙时，请随时向她求助好了。
because this is easier to shape than other kinds.
因为燧石较之其他石头更容易成形。