Experts say La Nina tends to reduce high altitude winds that weaken hurricanes.

专家表示，拉尼娜现象往往会减少高空风，从而削弱飓风。

The jet stream is a fast-moving, high altitude wind current that forms where cold and warm air meet.

急流是一种快速移动的高空气流，形成于冷空气和暖空气相遇的地方。