Indespensability
n. 不可少, 必需
🗣️ 情景例句
before getting to the tough stuff--math.
在对付难缠的东西 数学 之前。
An occasion lost cannot be redeemed.
时机失了无法挽回。
We'd have to compare notes on what we've discussed during the day.
我们想用点时间来研究讨论一下白天谈判的情况。