高能力组的受试使用的策略种类更多，策略使用情况与理解程度紧密相关；
The subjects at the higher proficiency level tend to use a wider range of strategies and not just a narrow set.
许多不同种类的植物已形成耐受干旱期的策略。
Many different kinds of plants have developed tactics to weather dry spells.
IBM SONAS能让我们创建三种类型的策略：放置策略、迁移策略和删除策略。
IBM SONAS allows us to create three types of policies: placement policy, migration policy and deletion policy.
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