这表明褐飞虱的致害性是可变异的，水稻品种抗、感虫特性是其转化的诱因。
It is suggested that virulence of rice brown planthopper was variable and the character of variety resistant or susceptible to insect was the exterior factor of virulent shift.
世卫组织发出警告，该动物病毒(H5N1)可变异为容易在人与人之间传播的病毒。
WHO warns that this animal virus (H5N1) could change into a form which spreads easily from person to person.
化学家们对他们在放射体中发现的元素同样感到惊奇：这些元素经历了原子结构变异，而原子结构一直被认为是不可变的。
Chemists had no less astonishment as they recognized in these radioactive bodies, elements which had undergone modifications of the atomic structure which had been thought unalterable.
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