Nonvariational
非变分的
🗣️ 情景例句
What did I do with them?
我把它们放在哪儿了？
All things are easy that are done willingly.
做事乐意，诸事容易。
It was upon this principle that the first instruments were made,
据这一原理，制造出了最初的地震仪器，