他们还提到，由于担心以前的全细胞百日咳疫苗日渐增强的致反应力，因此不推荐对6岁以上年龄的青少年使用。
Previously vaccination against pertussis was not recommended for those over 6 years of age, they add, because of concerns of increased reactogenicity of the whole-cell vaccines.
弹性模量随应力和驱动电压的增大而逐渐增大，但电压升至一定程度时将基本趋于稳定。
Stiffness increase with the increased of compress stress and driven voltage, and became stable when the driven voltage up to some degree.
随着核壳粒子橡胶相尺寸的减小，改性体系的冲击强度逐渐增加，内应力降低，但对体系的剪切强度影响并不显著。
With the decrease of core sizes, the impact strength modified systems increases and the internal stress of modified systems decreases apparently, while shearing strength changes slightly.
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