沙尘暴区上空垂直螺旋度的垂直分布为中高层负值，低层正值。
The distribution of helicity over the sandstorm area was negative at higher levels and positive at lower levels.
中国需要更多的象这样将尘暴区居平易近考虑在内的可持续性打算。
China needs more sustainable programs like these, efforts that take the dust bowl's inhabitants into account.
人们记忆中最近的一次最具破坏性的旱灾发生在二十世纪三十年代美国的“于旱尘暴区”，它仅持续了六年。
One of the most destructive droughts in recent memory is the 1930s American Dust Bowl, which lasted only six years.
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