An essential prerequisite
必要条件
🧩 词语组成解析
an
[æn]
art. 一（在元音字母前代替不定代词a）;一任一某一;一个;
prerequisite
['pri:'rekwizit]
n. 先决条件，前提，必要条件;
adj. 必须先具备的，必要的;先决条件的;
🗣️ 情景例句
Goodbye, thanks for inviting me. I had a lovely time.
再见，谢谢您的邀请。我度过了一段美妙的时光。
We need them urgently.
我们急需这些资料。
(A light year is the distance which light travels at 186,000 miles per second in one year,
一光年是光以每秒186，000英里的速度在一年内走的距离，