Extremal
[计] 极值曲线
🗣️ 情景例句
People are busy shopping and wrapping presents for relatives and friends before Christmas Eve.
在圣诞节前夜，人们忙着为亲朋好友买东西、包礼物。
I'm the worst pupil in my party.
我是我的聚会中最坏的学生。
I'll knock again, Helen.
海伦，我再敲一次。