And it also discovered traces of methane.

是的，火星地表有有。

Surface water-mostly rivers, lakes and reservoirs-will not flow from one basin into another without artificial diversion, and usually only with pumping.

地表水——主要储存于江河、湖泊和水库内——如果没有人工的疏导，不会由一个盆地自动流往另一个盆地，一般只能使用抽水抽取。

And that journey towards Cornwall's mining revival begins here around 300 meters below the surface.

而康沃尔矿业复兴的旅程始于地表以下约300米处。

In this method of farming, seeds and fertilizer are put into the soil through small cuts made in the surface of the ground.

用这种方法耕作，种子和化肥可以通过地表很小的切口放入土里。

If there are organics hidden under the Martian surface... Phoenix will be able to sniff them out with a soil-analyzing instrument called TEGA.

如果有藏在火星地表下，凤凰号将借助一个叫TEGA的土壤分析仪发现它们。

One degree of latitude on the earth's surface equals almost 70 miles.

地表上的纬度一度相当将近七十英里。

On the ground, Ludendorff's offensive switches south, targeting the French. German troops advance 30 miles, but are halted at the River Marne, just as fresh American divisions enter the line.

地表上，鲁道夫的攻势转为南部，瞄准了法军。德军军队向前推进了足足30英里，但在马恩河被挡下。 这时，乍到的美军师团也在前线登场了。

On the surface live millions of people, and one of those people is you.

地表繁衍亿万生灵，其中就有小小的你。

Now for a scientific look at how this eruption is playing out beneath the surface.

现在我们来看看这次火山喷发是如何在地表下发生的。

All you gotta do is look beneath the surface.

你要做的就是看看地表下面。

What would you find about 240 miles above Earth's surface?

地表240英里之上有什么？

Where would you find about 20 percent of the world's surface freshwater?

世界上20%的地表淡水来自哪里?

So if you have areas of high elevation like towering sand dunes or hills, directly next to areas of low elevation like a depression, you can get spots like this where the water table nears or even exceeds the surface.

因此，如果是高海拔地区，比如高耸的沙丘或山丘，紧挨着低海拔地区，如洼地、便能看到这样的地方，那里的地下水位临近地表，甚至超过地表。

It seeps below the surface and begins working in just seven hours.

之后它渗入地表，7小时后开始起作用。

Some of the magma pushes through the cracks in the Earth's crust at vents and at fissures and reaches the surface where it is then called lava.

一些岩浆穿过地壳的裂口和裂缝到达地表，在那里它被称为熔岩。

Most of the animals and plants living on the surface will begin to die.

大多数生活在地表的动植将开始死亡。

But they were hundreds of meters below the surface, there were large amounts of water between them and safety, and the boys didn't know how to swim.

但他们位于地表以下数百米处，他们和地面之间隔着很深的水，而这些男孩们都不会游泳。

They could be metal as well but they are hard surfaces and sometimes they come out of the asteroid belt and closer to the surface of the Earth or at least our atmosphere.

它们也可能由金属构成，它们外表坚硬，有时飞出小行星带，来到离地表更近的地方，或者至少来到我们的大气层。

This feature is reflected in its “General Education” and “Core Curriculum” .

这一特点突出地表现在其“通识教育”和“核心课程”中。

They're not sure whether the gas comes from deep inside the Earth or near its surface but they believe that as the methane builds in a cavity in the ice it forms a mound.

他们不确定这些气体是来自地球深处还是地表附近，但他们相信，当甲烷在冰的洞穴中堆积起来时，就会形成土丘。