In this section, we'll discuss practical issues involved in controlling schema evolution and present a compact set of guidelines for writing queries across schema versions.

这一节讨论控制模式演化的实际问题，并提供出一组用于编写跨模式版本查询的指导原则。

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Available in both white and silver, the ultra-compact camera combines the extensive features of a D-SLR with all the practical benefits of a compact.

白色和银色的超小型相机结合了单反的广泛的功能和相机的所有实际利益。

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Product pointing delicate, compact stacked stone, has a unique retro sound and texture, surface texture clear, more practical, color selection voluminous.

产品勾缝细腻，石块堆积紧凑，具有独特的坚实和复古质感，表面纹理清晰，更具实用性，颜色选择面宽。

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On a more practical level, the unit is compact, USB-powered, and has a built-in audio-interface (no extra sound card required for headphone monitoring).

ENGADGET: Pioneer announces DDJ-WeGO two-channel DJ controller, provides entry-level jams

The blue-wheeled Complex is a lengthy board meant to replicate the feel of snowboarding, while the yellow-wheeled Spliff is more practical and compact--ideal for someone like Depp.

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