Flux looks quite different in the plane and in space because, in the plane, it is just another kind of line integral, while in space it is a surface integral.

平面中的通量和空间中的通量有很大区别，在平面中，通量仅仅是线积分的另一种形式，而在空间中，它表现为曲面积分。

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After spending a year in orbit around Vesta, Dawn will perform a trick rare in space travel-it will reignite its engines and head off to orbit another body.

在灶神星轨道呆了一年之后的“黎明”号将在太空旅行中进行一次罕见的表演- - -它会重新点燃发动机并转变方向环绕另一个天体运行。

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The computer would lay spheres in a disk, and when it ran out of room, it would move up until it found enough space to fit another sphere.

计算机将球形物放置在碟子上，当没有空间时，它会往上挪动直到其给其它球形物留足空间。

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"If you've watched James Bond films over the years, you know that anything with a harpoon, with a laser, with a net in space has the potential to grab another spacecraft and destroy it, " he told BBC News.

BBC: UK design to 'harpoon' old satellites

Another form of the chemical, monomethyl hydrazine, fueled the shuttle's maneuvering systems while it was in space, said Randy Azera, a former NASA engineer and consultant to CNN.

CNN: Four compounds from shuttle can harm on contact