上新世早期的大气环流被减弱，因此垂直风切变减小，助长了热带气旋的发展。
Tthe early Pliocene had a weakened atmospheric circulation, and therefore, reduced vertical wind shear, which is favorable for tropical cyclone growth.
垂直风切变仅仅是产生晴空颠簸的众多因素之一。
Vertical wind shear is only one of the many factors that cause CAT.
飑线的产生经常与不稳定能量和垂直风切变相联系。
The occurrence of squall lines is frequently associated with instability energy and vertical wind shear.
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