Indespensability
n. 不可少, 必需
🗣️ 情景例句
People are busy shopping and wrapping presents for relatives and friends before Christmas Eve.
在圣诞节前夜，人们忙着为亲朋好友买东西、包礼物。
The bone will have to be re-set.
你必须（被）接骨。
How many spiders are engaged in this work no our behalf?
有多少蜘蛛在为我们效力呢？