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
What time is it, anyway?
几点钟了， 顺便说一声。
The face is the index of the mind (or heart).
相为心证。
Mrs.Richards sent her children to school and went upstairs to her bedroom.
把孩子送去上学，然后来到楼上自己的卧室。