When microscopic Marine organisms known as phytoplankton multiply into a dense population at the ocean's surface, massive blooms can spread so far that they can only be seen from space.

当微小的海洋浮游生物在海洋表面大量繁殖时，其壮观的场面甚至能从太空观察到。

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But Dr Smith points out that many of these planets are either too close to their sun or too far away, meaning their surface temperatures are so extreme they could not support life.

但史密斯教授指出很多这些行星要么离它们的恒星太近，要么太远，这意味着行星表面的极端温度不适合生命存在。

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What we've seen so far has just scratched the surface.

到目前为止我们看到的仅仅是表面的东西。

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"Maybe this suggests it was wet not so long ago and hasn't penetrated so far into the surface, " said Dr Marty Tomasko, head of the Huygens imaging instrument.

BBC: NEWS | Science/Nature | Titan mission 'resounding success'

So far, it has only scratched the surface, with a clutch of measures to free up the professions and such small businesses as taxi-driving.

ECONOMIST: The budget passes, but more troubles loom ahead

Microsoft so far hasn't released any data about Surface sales, feeding speculation that the device isn't faring well against the iPad or competing tablets that run on Google Inc.

NPR: Earnings Preview: Focus On PCs In Microsoft's 3Q