在地面上

We analyze the magnetic storm on April 11, 2001 to investigate how the compression of the magnetopause would influence the magnetic field in the geospace and on the ground when it was strongly compressed.

集中分析2001年4月11日的磁暴事件，研究当磁层顶发生强烈压缩以后，在地球空间和地面上产生的磁场影响。

Deswehr soldier, with the 3rd platoon of the Quick reaction Force 5, is covered with mud after firing a mortar on muddy ground in a combat outpost in Chahar Dara district in the outskirts of Kunduz, May 8, 2010. REUTERS/Fabrizio Bensch

2010年5月8日，在昆都士郊区的察哈尔达拉区，一个战斗前哨中，德国联邦国防军第5快速反应部队3排的一名士兵从泥泞的地面上发射了一枚迫击炮弹，满身都是泥浆。

That is one of the reasons why NASCAR race cars can corner at such high speeds.

同样的轮胎在泥泞的地面上，其摩擦系数可能几乎为零。

When it has been decided where we are going to drill, we put up at the surface an oil derrick .

当钻孔地点决定后，我们就在那块地面上坚起一个井架。

The car should be on a level surface with the park ing brake on and engine off.

将汽车停放在水平的地面上，关闭发动机并拉紧手刹。

This building stands on firm ground.

这座建筑物建立在坚固的地面上。

And, as night fell, we decided to spend the night on solid ground rather than return to the ship.

当夜幕低垂时，我们决定在坚硬的地面上过夜而不愿回到商船上。

This fell on stony ground at the time.

这落在石地面上的时间。

Don't make your horse go so fast on this rough ground, you're riding for a fall.

别让你的马在这崎岖不平的地面上跑那么快，你这样太危险了。

Twin outrigger thrusters propel the bike across uneven terrains at speeds topping out at 440 kilometers per hour.

一对外置式推进器能使寒冻摩托在崎岖的地面上跑出440公里的最高时速。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。