Variational notation
[计] 变分记号
🧩 词语组成解析
a. 变异的
🗣️ 情景例句
One step at a time.
做事要一步一步来。
A person must strain one's ears to hear a wild animal in the forest.
在森林里，人类必须对野兽竖起耳朵才行。
Could you tell me where I can wash my hands?
请问洗手间怎么走？