查询功能是产品的一个便捷特性，但它不受高端数据库中所有高级查询优化器的支持。
The query functionality is a valid convenience feature of the product, but it is not backed by all the sophisticated query optimizers found in top-end databases.
与其设计一个全新的产品去适应某一价格区间，大多数制造商会决定使用一个成本更低的方式，简单的“削减”一下现有高端产品的功能。
Instead of designing a completely new product to fit a certain price range, large scale manufacturing dictates that it is often cheaper to simply "cripple" an existing high-end product.
虽然存储虚拟化曾经是高端存储系统的独特功能，但是现在它是 Linux 的标准功能。
Storage virtualization was once a feature unique to high-end storage systems, but it is now a standard feature of Linux.
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