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。
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！
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。
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。
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。
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。
它的表面还是干干净净的。
Why is the sun's atmosphere hotter than its surface?
——为什么太阳的大气层比表层更热？
Its surface was powdery and sprinkled with grains of black dust.
月球的表面是粉状的，上面散布着一些黑色的尘土。
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。
Sunspots are caused by irruptions into its surface of the sun's deeper magnetism.
太阳黑子是由入侵活动进入太阳深层磁性表面造成的。
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。
Mars has not yet yielded definitive evidence of liquid water active on its surface today.
如今，还没有确凿的证据表面火星表面有液体的水存在。
However it is unusual in that it lost much of the hydrogen from its surface as it ballooned.
但是不寻常的是，在膨胀的过程中，大部分的氢元素通过表面消失。
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 order for a cell to respond directly to insulin it must display an insulin receptor on its surface.
为了使一个细胞能够直接对胰岛素做出反应，因此在它表面必须有一个胰岛素受体。
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。
Scientists estimate that a desert needs year round plant cover over 20 to 40 percent of its surface.
科学家估计一年之中植物必须覆盖沙漠表面的20%到40%。
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。
It orbits the star once every 1.6 days, meaning its surface temperature is upwards of 3500 degrees Fahrenheit.
它围着恒星1.6天旋转一周，就说明它的表面温度达到了华氏3500度。
It orbits the star once every 1.6 days, meaning its surface temperature is upwards of 3500 degrees Fahrenheit.
它围着恒星1.6天旋转一周，就说明它的表面温度达到了华氏3500度。
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