Nonholonomic constraint
[化] 非完整约束
🧩 词语组成解析
🗣️ 情景例句
How about some ice?
来点冰怎么样？
Opportunity only knocks once.
机不可失，时不再来。
I had just lost $50 and I felt very upset.
我刚刚丢了50英镑，感到非常烦恼。