蛋糕和其他烘焙点心在全球各地都是圣诞到新年间的食物，尤其是圆形、或环形的点心。(沪江小编按：求团圆、圆满，看来全球都一样嘛！)

Cakes and other baked goods are commonly served from Christmas to New Year's around the world, with a special emphasis placed on round or ring-shaped items.

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接近照片顶部尽头(即北部)，冰雪变得较稀少，但是左上角一个巨大的撞击陨石坑壁却为环形山底的一块椭圆形积冰提供了庇护所。

Toward the top (northern) end of the image, the ice becomes sparser, but the walls of a large impact crater in the upper-left corner provide a refuge for an oblong ice deposit on the crater floor.

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科尔黑洞中心是不是奇点而是奇环-由自身动量维持的一维环形。它有两个视界(外部视界和内部视界)以及一个椭圆形的能层(ergosphere)。

At the centre of a Kerr black hole, there is no point singularity, but rather a ring singularity-a spinning one-dimensional ring held open by its own momentum.

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