Located in tropical areas at low altitudes, savannas are stable ecosystems, some wet and some dry consisting of vast grasslands with scattered trees or shrubs.
"热带稀树草原位于热带地区，海拔较低，是一种稳定的生态系统，由广阔的草地和稀疏分布其中的树木或灌木组成，有些地区湿润，有些地区干燥。
The quality of high altitude sampes are better than low altitudes.
低海拔地区大黄的质量不及高海拔地区；
Bailey agrees Lippl's findings are interesting but laments the study's lack of a control group staying at low altitudes.
贝利也认为利普的发现很有趣，但遗憾的是实验没有在低海拔地区设置对照组。
Only small aircraft, and those needing tough low-speed propulsion at low altitudes, for agricultural work and fire-fighting, still have piston engines.
只有一些小型的飞机，以及那些用于在低空低速爬升飞行的用于农业以及灭火用途的飞机仍然使用活塞发动机。
"However, the Civil aviation Administration of China has yet to confirm aviation regulations at such low altitudes, which may become a problem," Xinhua said.
“不过，中国民用航空总局尚未确认航空规章，在这样低的高度，这可能成为一个问题，”新华说。
Obtained results verify the feasibility of proposed system and indicate that the system can be used in the missile end-guiding and the topographic matching of aerocrafts in low altitudes.
实验结果验证了该接收系统的合理性，表明该系统可以满足导弹末制导使用或是低空飞行器下视地形匹配。
The propagation at low altitudes and the ADC noise in the RF direct sampling system taken are considered, and the main factors which affect the coverage of low altitude detection is analyzed.
考虑低空传播以及直接采样系统中adc器件的噪声，分析了低空探测时影响观测范围的主要因素。
On the left, the purple, cyanand green hues signify low, medium, and high altitudes, respectively.
左图中的紫色、蓝绿色和绿色分别表示低、中和高海拔。
Since you need to breathe more to compensate for low oxygen at high altitudes, drinking could make you more likely to experience hypoxia.
在低氧的高海拔地区，你必须多呼吸，而渴酒会让你缺氧的可能性提高。
But plane soot occurs at low enough altitudes for rain to wash it out of the atmosphere in just days or weeks.
但是飞机烟尘是在低纬度，雨水在几天或几星期就把它们从空中冲洗干净了。
Inside the tube you create a low pressure environment very similar to an airplane that's at high altitudes.
在管道内部我们会创建低压环境，类似于在高海拔飞行的客机。
The performance of turbocharged diesel engines at different high altitudes was studied on the engine test bed for simulating high altitude (low air pressure).
在内燃机高海拔(低气压)模拟试验台上，对不同模拟海拔高度下的涡轮增压柴油机性能进行了试验研究。
The performance of turbocharged diesel engines at different high altitudes was studied on the engine test bed for simulating high altitude (low air pressure).
在内燃机高海拔(低气压)模拟试验台上，对不同模拟海拔高度下的涡轮增压柴油机性能进行了试验研究。
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