a point equidistant from the ends of a line or the extremities of a figure
造句
用作名詞(n.)
At the midpoint of the bridge she stopped. 在橋的中點處她停了下來。
Then we discuss the necessary conditions for the limit curve to be C0,C1,C2 respectively and give the derivative and second derivative of the limit curve at vertex and midpoint. 隨后我們討論了極限曲線連續(xù)，一階連續(xù)，二階連續(xù)的必要條件，并給出了極限曲線在頂點以及中點處的一階導(dǎo)數(shù)與二階導(dǎo)數(shù)顯式公式。