Nucleus substitution
[化] 环上取代反应
🧩 词语组成解析
substitution
[ˌsʌbsti'tju:ʃən]
n. 代替;代用;替换;<化>取代（作用）;
🗣️ 情景例句
Just a moment, I'll ask him.
稍等，我问一下他。
Can I help?
要我帮忙吗？
Autumn is a busy season. The days get shorter and the nights get longer.
秋天是繁忙的季节。白天逐渐变短，夜晚则渐渐变长。