If a spacecraft travels faster than 11 km a second, it escapes the Earth's gravitational pull.

如果一架宇宙飞船飞行超过每秒11公里，它就能摆脱地球引力。

《柯林斯英汉双解大词典》

That would mean an annual loss of 3, 250 sq km a year, a good chunk of rainforest but less than the area of discarded pasture that returns to forest each year.

这就意味着每年森林消失面积为3,250平方公里，对雨林来说的确不小，但还不如每年回归森林的废弃牧场面积大。

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It will travel around the Earth at a height of 300 km.

它将在300千米的高度绕地球运行。

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Riding on cutting-edge technologies such as flex oDSP, super SD-FEC, and flex modulation format, this field trial achieved a record-breaking transmission distance of 1, 500 km using a super-channel PDM-16QAM-based high spectral efficiency solution, and a second record-breaking transmission distance of 3, 325 km using a super-channel Nyquist PDM-QPSK-based ultra-long-haul solution.

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The sediment layer would have to be less than a km (half a mile) thick in order to have the observed effect, and would probably cover only patches of the outer core.

BBC: Earth's wobbles reveal deep secrets

The researchers used data from the global network of solar monitoring telescopes (Gong) as well as the Soho satellite positioned in a stable orbit 1.6 million km (a million miles) closer to the Sun than the Earth.

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