Ethynation
乙炔化
🗣️ 情景例句
No, thank you.
不， 谢谢 。
The best mirror is an old friend.
老朋友是最好的镜子。
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。