从极点出发的搜索方向是该点处所有下降棱方向的一种凸组合。
The direction of search starting from an extreme point is a convex combination of all descent directions along the edges at the point.
阿特拉斯是两者中较平整的一个，从南极点到北极点的直径只有18公里，但是它的赤道周长却有40公里。
Atlas, the flatter of the two, has a diameter of only 18 kilometres from pole to pole, but is almost 40 kilometres across its waist.
从列侬的所有翻唱歌曲中，我们也想找出一个积极点的名单- - -或者甚至是少数愚蠢的。
We want to strike a positive note as well-or even a few silly ones-with a collection of Lennon covers.
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