Singleton substitution
[计] 唯一替换
🧩 词语组成解析
n. 一个, 独生子, 独身
substitution
[ˌsʌbsti'tju:ʃən]
n. 代替;代用;替换;<化>取代（作用）;
🗣️ 情景例句
but they need me at the hospital today,
但今天医院有事，
Forest fire caused by lava
熔岩引起的森林大火
It is all very well for such things to occur in fiction.
这种事发生在小说中是无可非议的。