Operator equation
[计] 算子方程
🧩 词语组成解析
🗣️ 情景例句
It's small,
它小小的，
Quick! Seize that child before she falls down.
快！趁还没掉下去，快抓住那孩子。
Aunt Harriet lived in that leisurely age when servants were employed to do housework.
哈丽特生活在一个悠闲的年代，家务事都由雇来的佣人代劳。