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。

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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。

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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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