The immediate cause of the problems is the behaviour of the jet stream, a band of high-level wind that travels east around the world and influences much of the weather below it.
引起这些问题的直接原因是急流[注1]的运动方式 ----在高空、绕地球向东流动并能给下面的天气造成很大影响的一股风。
Some suggest this may be deliberate but it also may well reflect poor training and inadequate flying hours to maintain the high-level of proficiency that a fast jet requires.
一些人认为，这也许是故意的，但是这也可能是训练不足、飞行时间不够，无法满足高速喷气机需要的高度熟练度。
Sandstorms and high level jet stream always occurred together.
沙尘暴与高空急流总是相伴出现。
The results prove that the water jet cutter is characterized by its high efficiency, low specific power consumption and fine automation level. Therefore it is a new type of cold cutting machine.
结果表明：该水刀具有切割效率高、比能耗低、自动化程度好等特点，是一种新型的冷切割设备。
Therefore, the position and intensity of the high and low-level jet can be used for the short-range forecast indicator of the snowfall and falling area.
高低空急流的位置及强度可作为降雪量和大-暴雪落区的短期预报指标。
The liquid level must be high enough to assure the gravity circulation of liquid. In the jet pipe, the flowing gas holds a turbulent state.
要求液面高度能保证净化液的自流，射流管内气体处于湍流状态，混合气流速度应达到连续射流所需的临界速度。
The liquid level must be high enough to assure the gravity circulation of liquid. In the jet pipe, the flowing gas holds a turbulent state.
要求液面高度能保证净化液的自流，射流管内气体处于湍流状态，混合气流速度应达到连续射流所需的临界速度。
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