From the small number of impact craters that appear on Martian lava flows, one can estimate that the planet was volcanically active as recently as a half-billion years ago—and may be active today.

从火星熔岩流上出现的少量陨石坑中，我们可以估计，在5亿年前，这个星球上的火山还很活跃——也许现在依然活跃。

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Half of those surveyed say that the penalty should be as severe as that for drunk driving.

一半的受访者表示，处罚应该和对待酒后驾车一样严厉。

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As I said, we believe that "Don't be evil" is only half of it.

就像我说的我们认为不干坏事只是表达了意思的一半。

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It reported that they were more likely to be poor and that their infant mortality rate was half as high again as that of the rest of the population.

ECONOMIST: Black Colombians suffer ��structural discrimination��

At the same time, Apple continues to work with its manufacturing partners in Asia on a less expensive iPhone that could be launched as soon as the second half of this year, these people said.

WSJ: Apple to Begin iPhone Production This Quarter

Many books produced after 1998 are still to be located but it is estimated that more than half a million signatures were generated as part of the campaign.

UNESCO: Communication et information