A wooden beam 15 feet off the floor.

一根距离地面15英尺的木头房梁。

We are not contemplating putting boots on the ground.

我们不考虑输送地面部队。

Land bases were often unavailable because of awkward geography or recalcitrant allies.

由于地理位置不佳或盟友顽固不化，地面基地常常无法使用。

Israel's ground troops were poised to enter Gaza.

以色列地面部队准备进入加沙。

At these latitudes, the sun's rays are glancing and not enough of their energy reaches the ground to enable trees to grow.

在这个高纬度地区，太阳辐射只能斜射到这片土地，到达地面的能很少，并不足以支持树木生长。

He noticed that the ground beneath his feet had an unusual composition.

他注意到脚下的地面含有一种不同寻常的成分。

The technique detects subtle differences in ground density.

这项技术可以检测出地面密度的细微差别。

Of course, you need to deliver ammunition and supplies to drops on the ground.

当然，你还需要运送弹药和日常供给到地面。

The house detective's piggy eyes surveyed her sardonically from his gross jowled face. His gaze moved on to sweep the spacious, well-appointed room, encompassing the Duke who faced them uncertainly, his back to a window.

探长长着厚厚的双下巴，脸上的猪眼睛讥讽地打爵夫人一眼。然后他扫视一圈这个宽敞豪华、设施完备的房间，看到爵这时背朝窗户神色茫然地面对着他们。

Meteoroids become meteors when they enter our atmosphere and meteorites when they hit the ground.

流星进入地球大气层时会变成流星，撞击地面时变成陨石。

Frost are ice crystals on a frozen surface.

霜就是冻结在地面上的冰晶。

The clover sprang up green and luscious.

芬芳的三叶草冒出地面。

Now, smoke still rose up from the warm ground over the desolate hills.

而现在，发热的地面上仍然升腾着烟雾，弥漫在荒凉的山丘上。

But now, places have been found on earth that are in total blackness, such as caves several miles beneath the surface, and bacteria, primitive forms of life, have been seen there.

但是现在人们在地球上一些完全暗无天日的地方也发现细菌等原始的生命形式，比如地面几英里以下的洞穴中。

Meteorites are rocks from space that have hit the ground and we have recovered.

“Meteorites（陨石）”是我们已经找到的，从太空撞到地面的岩石。

We hear the gun go hit the floor.

我们听见枪击地面的声音。

The other big argument is that when you burn fossil fuels, you release substances trapped in the ground for a long time, which leads to some long-term negative effects, like global warming and the greenhouse effect.

另一个大争议是，当你燃烧化学燃料时，会释放出长期滞留在地面的物质，这种物质会导致一些长期的负面效果，比如全球变暖和温室效应。

Once you've returned to earth, make your way to the Washington Avenue Historic District.

回到地面之后，是时候前往华盛顿大道历史区。

They show a huge crater, and not much of the plane is left.

图片显示，地面被砸出一个大坑，飞机残骸所剩不多。

Then autumn leaves turn brown, fall into piles upon the ground.

然后秋天的树叶变成棕色，落在地面的树桩上。