头颅钝器伤的严重程度不一。

Blunt injury to the skull may be of varying severity.

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这一方面因为同一种病毒在不同的人致病的严重程度不一，另一方面因为它可以演变。

This is partly because the same virus can be mild in some people and severe in others, and partly because it can evolve.

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湿疹(有时候也称为皮炎)是一种皮肤炎症，可发生于所有年龄段，并且严重程度不一。

Eczema (or dermatitis as it is sometimes called) is a type of inflammatory skin condition which can affect all ages and can vary in its severity.

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