Indespensability
n. 不可少, 必需
🗣️ 情景例句
Until today, I was never really interested in medicine.
直到今天 ，我才对医学真正感兴趣。
I guess he will say something.
我猜他会说什么。
It could only get over the mountains if it rose to 10,000 feet.
只有在飞至10，000英尺的高度时，它才能飞过这些山头。