To form a tornado, cold air must sit above warm and moist air, and the wind needs to go in different directions at different heights, creating shear forces.
形成龙卷风，寒冷的空气必须处在暖湿的空气上部，而风应该在不同高度向不同的方向运动，以此创造出剪切力。
Scientists believe La Nina spurs hurricane formation in the Atlantic basin by hindering wind shear that breaks up storms as they form.
科学家认为，由于“拉尼娜”阻碍了可破坏暴风雨形成的风切变，所以它会促使大西洋洋面形成飓风。
This zone is traditionally called shear zone in view of fact that the material in the final form would be removed by shear from the parent metal.
考虑到最终形状中的材料是通过剪切从母体金属去除的，此区域传统上称为剪切区。
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