Extremal
[計] 極值曲線
??? 情景例句
He's unwilling to accept advice.
他不愿接受勸告。
Yes, I worked from early morning until late at night.
是,我從清早工作直到半夜。
The lower gun-ports were now below water and the inrush sealed the ship's fate.
下層炮眼已淹沒在水里，涌進船艙的水給瓦薩號帶來了難以逃脫的厄運。