Tthe early Pliocene had a weakened atmospheric circulation, and therefore, reduced vertical wind shear, which is favorable for tropical cyclone growth.
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。
The shear spring bears most of the vertical loading, which decreases the vibration frequency.
剪切弹簧承担大部分垂直方向的载荷，降低震动频率。
Weak vertical shear and warm sea surface are other reasons to remain the intensity of typhoon.
弱的垂直切变和暖洋面的存在也是台风强度维持的原因之一。
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