Indispensible
不可或缺
🗣️ 情景例句
Not bad.
不错。
Every lover sees a thousand graces in the beloved object.
情人眼里出西施。
many of them serious and senior scientists---- who dream of sending people to it.
其中的不少人是认真和资深的科学家，他们一直梦想着把人送上火星。