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。

youdao

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。

youdao

Sandstorms and high level jet stream always occurred together.

沙尘暴与高空急流总是相伴出现。

youdao

In both instances, the Met Office failed to predict the movements of the jet stream - the high-level wind that races round the world 10km above the surface.

BBC: Met Office cools summer forecast