They are pilot controlled, fly at low altitudes and operate like drones.

它们会由飞行员控制进行低空飞行，操作起来就像无人机一样。

Every spring in Wyoming, vegetation first appears at lower altitudes before progressing up the mountainside.

每年春天，怀俄明州的植被首先出现自较低海拔地区，之后再向山坡蔓延。

First, mule deer. Every spring in Wyoming, vegetation first appears at lower altitudes before progressing up the mountainside.

首先是北美黑尾鹿。每年春天，怀俄明州的植被首先出现在较低的海拔地区，之后再向山坡蔓延。

Most birds strikes on airplanes occur during takeoff or landing at lower altitudes where birds are more common to be.

鸟类撞机事件大多发生在飞机在低海拔地区起飞或降落过程中，在该区域鸟类频繁出没。

Eyewitnesses reported the helicopter which was on a relief mission was flying at a low altitude when it crashed into power lines.

目击者称这架当时在进行救援任务的飞机飞得很低，然后撞到输电线路上。

And if you're only climbing at low altitudes, then the summer really is your best bet when the roads and hiking routes are most accessible.

如果只在低海拔地区登山，那么夏天是最好的选择，因为此时的道路和徒步旅行线路最易通行。

Crucially, acoustic detection works best at the low altitudes where most combat drones fly.

至关重要的是，声学探测在大多数战斗无人机飞行的低空效果最佳。

Sure enough, surging glaciers hotspots are in temperate-latitude mountains, such as Karakoram, and at lower altitudes, like Svalbard.

果然，涌动的冰川热点位于喀喇昆仑、等温带山区和斯瓦尔巴群岛等低海拔地区。

(MUSIC)From our " don't try this at home or really anywhere" files, a low altitude parachuting competition in China.

（音乐）来自我们的“不要在家里或任何地方尝试这个” 文件，中国的低空跳伞比赛。

And Luciana teases out what the forest is doing by comparing results from the highest to the lowest altitude.

卢西亚娜通过比较最高海拔和最低海拔的结果来梳理森林的作用。

So, flying higher means you burn less fuel for less time and avoid the weather and associated turbulence of lower altitudes.

因此，飞得更高意味着您可以在更短的时间内燃烧更少的燃料，并避免低海拔的天气和相关湍流。

And then you hook the pump up and you pump it up so that the pressure inside the bag simulates being at a lower altitude from a physiologic standpoint.

然后你把泵挂起来，把它抽起来，这样袋子里的压力就模拟了在较低海拔的生理环境。

The Robusta beans are generally grown at lower altitudes on commercial plantations, where the berries are harvested all at once, ripe or not.

罗布斯塔豆一般生长在低海拔的商业种植园，在那里浆果一次收获，成熟与否。

Each route would be carefully defined, sticking  to low altitudes and avoiding no-fly zones, critical infrastructure or places with  difficult wind conditions or terrain.

每条路线都将经过仔细定义，坚持低海拔并避开禁飞区、关键基础设施或具有恶劣风力条件或地形的地方。

Starting at nearly 8,000 feet, this river of ice twists and turns down to an elevation of just over 4,000 feet, making it the lowest altitude glacier in the US.

这条冰河从近 8,000 英尺开始，蜿蜒曲折下降至海拔 4,000 多英尺，成为美国海拔最低的冰川。

Mallinson, after the first novelty had worn off, found himself no less fatigued than on many sight-seeing excursions at lower altitudes; the lamas, he feared, were not likely to be his heroes.

马林森在最初的新鲜感消退后，发现自己的疲劳程度不亚于在低海拔地区进行许多观光游览时的疲劳程度。他担心喇嘛们不太可能成为他的英雄。