Secondly they will have to make a reliable map of its surface.
其次，他们必须制作一张可靠的关于它表面的地图。
Space probes have provided evidence that Europa has a large ocean under its surface.
太空探测器提供的证据表明，木卫二表面下有一个巨大的海洋。
The hyperbolic surface, which has so-called negative curvature because its surface curves up and down at the same time, like a saddle.
双曲曲面，即通常所称的负曲率，因为它的表面同时向上和向下弯曲，就像一个马鞍。
A modern microprocessor requires a billion-dollar plant called a fab to etch onto its surface the tiny electronic components that make it run.
现代的微处理器需要十亿美元的被称为fab 的工厂，以在其表面蚀刻出使其得以运作的微型电子元器件。
Some scientists speculate that Mars may have enjoyed an extended early period during which rivers, lakes, and perhaps even oceans adorned its surface.
一些科学家推测，火星在早期很长时间里可能都有以河流、湖泊，甚至海洋装点着它的表面。
Because the Moon has no atmosphere, its surface is not subject to erosion, so it retains the marks of its early history.
由于月球没有大气层，它的表面不会受到侵蚀，所以它保留了早期历史的痕迹。
Once all this information has been gathered, it becomes possible to judge whether a lake's flow is mainly due to its surface inputs and outputs or to its underground inputs and outputs.
一旦收集了所有这些信息，就有可能可以判断一个湖泊的流量主要是由其表面还是地下的输入和输出导致。
The bigger the animal is, the lower its surface-to-volume ratio; for every ounce of body mass, there is proportionately less surface through which heat can escape.
动物体型越大，其体表体积比越低；躯体每增加一盎司的重量，所能散发热量的表面就成比例减少。
In response to viral infection, the immune systems of mice typically produce antibodies that destroy the virus by binding to proteins on its surface.
在病毒感染的反应中，老鼠的免疫系统通常会产生抗体，通过与病毒表面的蛋白质结合来破坏病毒。
Since a plant uses it up in the air around, the plant needs moving air to bring more CO2 close to its surface!
由于植物会将周围空气中的二氧化碳耗尽，因此需要空气流动将更多的二氧化碳带到其表面！
Why is the sun's atmosphere hotter than its surface?
——为什么太阳的大气层比表层更热？
The brightness of a star depends on its surface temperature and size.
恒星的亮度取决于它的表面温度和大小。
As it cooled, an ocean of magma covering its surface began to crystallize.
当星球冷却后，覆盖其表面的岩浆海洋开始定形。
Though Mars' atmosphere is very dynamic, its surface doesn't show change like Earth's.
尽管火星的大气层是不断变化的，它的表面并没有展现出像地球一样的变化。
In 1986 one mine far from the town was flooded and a sink was formed on its surface.
1986年，小镇远处的一个矿山被水淹没，地表出现塌陷。
The heterogeneous catalyst first attracts the salt to its surface and holds it there.
多相催化剂先将盐吸附在它的表面并使它固定在那里。
The number of spots on its surface has waxed and waned in cycles that last, on average, 11 years.
太阳表面的黑子数在其一般延续11年的活动周期内增增减减。
In the case of Vesta, telescopes have spied evidence for the eruption of lava (basalt) on its surface.
就灶神星而言，望远镜曾发现过它表面喷发过玄武岩岩浆的证据。
The planet appears to have an atmosphere, gravity like our own – and could have flowing water on its surface.
该行星似乎也拥有大气层和重力作用——其表面也可能有流水存在。
Why is the sun's atmosphere hotter than its surface? A new finding brings us one step closer to the answer.
为什么太阳的大气层比表层更热？一项新发现让我们离答案更近一步。
Smooth ice provides very little resistance against objects, like ice skates, being dragged across its surface.
光滑的冰面对于物体——譬如在冰面上拖曳的冰刀——施加极小的摩擦阻力。
The crystal grows by continuing to collect water vapor, and by the attachment of water droplets to its surface.
通过水蒸汽的吸收和表面小水滴的附着，冰晶会逐渐变大。
Pluto, now classed as a dwarf planet, is so small and so distant that its surface has been a mystery to astronomers.
现在归类于矮行星的冥王星是那么小，那么远，对天文学家来说，其表面一直是个谜。
From space, the earth looks blue. This is because about seventy-one percent of its surface is covered by water.
从太空中看，地球是蓝色的。这是因为地球表面约百分之七十一都被水覆盖着。
About half of its surface area is less than 1m above sea level, and large parts of it are actually below sea level.
大约有一半的地区的海拔小于1米，大部分地区低于海平面。
In another 5 billion years it will swell into a red giant and either consume our planet or bake its surface to concrete.
再过五十亿年，它将膨胀成一颗红巨星，到时就算我们的地球不被它吞并，行星表面也将被烤成混凝土。
In another 5 billion years it will swell into a red giant and either consume our planet or bake its surface to concrete.
再过五十亿年，它将膨胀成一颗红巨星，到时就算我们的地球不被它吞并，行星表面也将被烤成混凝土。
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