Contextual and situational factors must be taken into account in using and understanding modals.

理解和使用情态动词，必须考虑语境因素。

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Then by using thin aluminum shell to make flection experiments, and influence of geometry parameter factor on blast furnace shell's critical load and flection modals was analyzed.

然后用薄铝壳来模拟鲅鱼圈1号高炉炉壳进行屈曲实验，分析有关几何参数对高炉炉壳轴向临界载荷和屈曲模态的影响。

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